Newtons of Class 10 by SOWMYA

Hai Children, this might be a new platform for us to be upgraded to next level in remote learning, say hello!! to your friends, and use this platform for discussion about the lesson with your friends as well as with your teacher.....

sowmyaananth53 — 2020-07-22 12:52:45 UTC

Welcome kids!!

Prisha

2020-07-27 17:40:15 UTC

Conditions for a light ray to pass undeviated on refraction :

Angle of incidence must be 0 at the boundary of two media.
The refractive index of medium 1 and medium 2 must be the same.

Relationship between wavelength in the both the mediums :

The frequency is f and wavelength lambda suffers refraction.
It takes place from a medium (air) to another medium.
The speed in air is c and in the next medium, the speed is V.
Frequency remains unchanged, but wavelength changes.
Then,

S.RATNESH

2020-07-28 03:22:59 UTC

Condition for a light ray to be undeviated:
1.If the angle of incidence is equal to zero and the angle of refraction is also zero, then we can get a light ray and deviated.
2.Both the medium is same then the light ray is deviated.
Relationship of wavelength in the two medium:
1.If a ray of light of frequency and wavelength suffers refraction from air to a medium in which the speed of light is V,
2.then the frequency of light remains unchanged.
3.Obviously when light passes from a rarer to a denser medium, its wavelength decreases
4. But if light passes from a denser medium , its wavelength increases.

Nithya Shree.G

2020-07-28 05:00:40 UTC

conditions for a light ray to be undeviated:
When the angle of incidence is zero, then light ray can pass undeviated. Because, If the angle of incidence is zero, means, the light Ray is traveling perpendicular
to the medium.
So, if the refractive index is the same,means, the speed of
light does not change as
the ray propagates.

Harikesh

2020-07-28 05:08:14 UTC

Conditions for a light ray to pass undeviated on refraction:
(1) The angle of incidence must be zero at the boundary of two media.
(2) The refractive index of medium 2 is same as medium 1.
Relationship between wavelength in the both the mediums :

The frequency is f and wavelength lambda suffers refraction from the air.
It takes place from a medium to another medium.
The speed in air is c and in the next medium, the speed is V.
Frequency remains unchanged, but wavelength changes.
Light passes from rarer medium to denser medium.

MIRUTHULLA VAANI.R

2020-07-28 06:16:48 UTC

CONDITIONS FOR A LIGHT RAY TO PASS UNDEVIATED ON REFRACTION :
#the angle of incidence must be zero at the boundary of two media.
#the refractive index of medium 1 and medium 2 should be same.

RELATIONSHIP BETWEEN WAVELENGTH IN BOTH THE MEDIUMS :
#the frequency is f and wavelength lambda suffers refraction.
#it takes place from an medium to another medium.
#the speed in air is c and in the next medium the speed is v.
#wavelengths change but the frequency remains unchanged.
#light passes from rarer to the denser medium.

relationship between the wavelength l = v/f in a medium and the wavelengthl ₀= c/f in vacuum:

THANK YOU.......

SHRIYAA S K

2020-07-28 07:37:04 UTC

Condition of the light to pass deviated on refraction:
1. Angle of incidence at the boundary of two medium =0
(i.e 2. When refractive index of the medium 2 is same as that of medium1.

Relationship between wavelength and in both the mediums:

Lamda' = lambda/Medium

Samyuktha

Samyuktha27 — 2020-07-28 13:10:00 UTC

Conditions for a light ray to pass undeviated on refraction.....

Angle of incidence at the boundary of two media is zero.
Refractive index of both the medium (1 and 2) must be same.

Relationship between wavelength in the both the mediums....

Frequency and the wavelength suffers refraction.
Frequency of the light is not changed.
The wavelength of the light changes.
Takes place from air to a medium where the speed of light is V.

Rutheeshtaa.Su

2020-07-28 14:07:42 UTC

Condition of light to pass deviated on refraction :
1.2.i=r

PARKKAVI.K😊

2020-07-28 15:53:21 UTC

conditions of light ray to pass undeviated
#when #when refractive ineed of medium 2 is same that of 1
Relationship between wavelength in both the mediums
☆frequency and wavelength suffers refraction
☆frequency of light is not changed
☆the wavelength of light changes
☆takes place from the air to the medium where the speed is V

R.Reshma Dharunika

2020-07-29 03:46:49 UTC

Conditions for a light ray to pass undeviated👇

Likitha.B

2020-07-29 06:55:55 UTC

$.when $.when when the refractive index of a denser medium = rarer medium /rarer medium = dender medium.

relation between wavelength in both the mediums

f=c/ λ
as c=v
f=v/ λ
so v=f λ
1µ2=v1/v2
1µ2=(f λ1)/(f λ2)
1µ2= λ1/λ2
λ2= λ1/ 1µ2
=λ1/(µ2/µ1)
=λ1/µ2
therefore
λ1=λ/µ
lamda is inversly proportional to mew.
λ1∝1/µ

Ahalya

ahalya01 — 2020-07-29 12:45:54 UTC

Conditions for a light ray to pass undeviated on refraction:
*The anfle of incidence at the boundary of two media should be zero
*The refractive index of medium 2 is same as that of medium 1
Relationship between wavelength in the two medium:
*In air f = speed of light/wavelength
*In medium f = speed of light in medium/wavelength
*Refractive index u = c/v
The light passes from rarer medium to denser medium ,its wavelength decreases but if light passes from denser to rarer medium,its wavelength increases.

kavya

kavya01 — 2020-08-03 05:49:32 UTC

Conditions for a light ray to pass undeviated on refraction :
Angle of incidence must be 0 at the boundary of two media.
The refractive index of medium 1 and medium 2 must be the same.
Relationship between wavelength in the both the mediums :
The frequency is f and wavelength lambda suffers refraction.
It takes place from a medium (air) to another medium.
The speed in air is c and in the next medium, the speed is V.
Frequency remains unchanged, but wavelength changes.

SUJAY KRISHNA

sujaykrishnab2w — 2020-08-04 05:02:04 UTC

.when $.when when the refractive index of a denser medium = rarer medium /rarer medium = dender medium.

relation between wavelength in both the mediums

f=c/ λ
as c=v
f=v/ λ
so v=f λ
1µ2=v1/v2
1µ2=(f λ1)/(f λ2)
1µ2= λ1/λ2
λ2= λ1/ 1µ2
=λ1/(µ2/µ1)
=λ1/µ2
therefore
λ1=λ/µ
lamda is inversly proportional to mew.
λ1∝1/µ

RG. Shree Sanjeya

2020-08-04 05:39:08 UTC

Conditions for a light ray to pass undeviated on refraction..
Angle of incidence must be 0 at the boundary of two media.
The refractive index of medium 1 and medium 2 must be the same.
Relationship between wavelength in the both the mediums..
Frequency and the wavelength suffers refraction.
Frequency of the light is not changed.
The wavelength of the light changes.
Takes place from air to a medium where the speed of light is V.

Rutheeshtaa.Su

2020-08-07 03:13:53 UTC

8.7.2020 homework
In the activity given in sway gives a clear answer for why a object placed in a water appears to be raised ???.
it is so, When an object is under the water then due to refraction of light through the water medium a virtual image of the object is produced nearer to the water surface and since the image is virtual so it appears to be raised by some height above the surface of water

Harikesh

2020-08-07 04:45:47 UTC

Homwork on 7/8/2020
Why an object placed in a water appeared to be raised?

When an object is under the water then due to refraction of light through the water medium a virtual image of the object is produced nearer to the water surface and since the image is virtual so it appears to be raised by some height above the surface of water

It happens due to the, phenomenon of refraction of light. When the rays of light from the coin, in the denser medium, fall on the interface separating the two media, the rays of light move away from the normal after refraction. The point from which the refracted rays appear to come gives the apparent position of the coin. As the rays appear to come from a point above the coin, therefore, the coin seems to be raised.

AHALYA

ahalya01 — 2020-08-07 06:29:17 UTC

In this activity I come to know that when an object is simply placed on the cup there is no refraction of light,so we cant see the object.But when we pour water into the cup slowly ,the object is also viewed slowly.And at last we saw the object fully.So if there is only refraction of light we can see the object.we conclude that the object is raised by some of the height,so that only we can see the object from farer place.
Thank you

SHRIYAA S K

shriyaa02 — 2020-08-07 06:37:24 UTC

7.8.2020(homework)
Needed things:
1. cup
2. an object
3. water
Procedure:
In this activity I came to know that when an object is simply placed on the cup .We have to move back until it the object in the cup is not visible.then pour water in to the cup then the object seems to be raised .
conclusion:
if an a object is placed in a denser medium and seen from rarer medium then it seems to be raised.

Kavya

kavya01 — 2020-08-07 06:43:36 UTC

Real and apparent depth:
An object placed in a denser medium when viewed from a rarer medium appears to be at a depth lesser than its real depth. This is because of refraction of light.
Example:
Picture shows the difference between the real depth and apparent depth of the object under water. We see the objects closer than their real depth to the surface. We see objects only if the rays coming from them reaches our eyes. In this picture, ray coming from the fish reaches the observer’s eye after refraction. Thus, observer sees the image of the fish at the distance Da from the surface which is the apparent depth of the fish. On the contrary fish sees the objects away from their real distances. These are all results of the refraction of light.

Samyuktha

Samyuktha27 — 2020-08-07 10:07:26 UTC

7,8.2020
Experiment on real and apparent depth_
If an object (for example a metal bob) is placed in a cup and if we move away from them the cup,we will not be able to view the object which is placed under the cup...

By pouring water into the cup,we will be able to identify few portion of the object.Later on adding more water we will be able to view the whole object from the same distance.

So,we can say that an object looks raised in a denser medium when it is seen from a rarer medium.

K.PAVITHRA

pavithra01 — 2020-08-07 10:37:29 UTC

7.8.2020
OBSERVATION :
When we move behind the object is not visible for us but when we pour some water into the cup we are able to see the object gradually becoming visible the more water we pour the the larger the object is visible.
CONCLUSION :
From this experiment i understood that Real Depth is actual distance of an object beneath the surface, as would be measured by submerging a perfect ruler along with it. Apparent depth in a medium is the depth of an object in a denser medium as seen from the rarer medium. Its value is smaller than the real depth.This is due to the refraction of light.

Prisha

2020-08-07 14:29:08 UTC

Activity on Real and Apparent depth.
I submerged a pencil in a glass of water and made the following observation :
The pencil appeared to be in a raised position than its original point. It also looked slightly bent.
From this observation and theoretical thinking, we can conclude that :
This raised and bent position is because of refraction of light from water (denser medium) to air (rarer medium).
The ray of light from the point travels in water and after refraction, bends away form the virtual normal line and appear to be coming from a different point.
The image we see is virtual and not real.

PARKKAVI.K

2020-08-07 16:20:42 UTC

OBSERVATION;
#The penicl was appeared to be raised from its original point and was slightly bent
CONCLUSION from theoritical thinking;
#the pencil appeared to be raised and bent because of the refraction of light form rarer medium(air) to denser medum(water)

Rutheeshtaa.Su<20.8.2020>

2020-08-20 03:12:39 UTC

India (230 Volts) and the United States (120 Volts) as an example. If the voltage is low, the amount of current passing through to produce the same amount of power is more. Therefore, there’s a lower risk of getting injured if one happens to come in physical contact with an unprotected live wire (as the voltage is low), but there are greater energy losses (as the current is high, resistance is high too). In countries having higher voltages, energy losses are lower, but the risk of sustaining injuries is much higher.

S.Ratnesh

2020-08-20 03:52:12 UTC

Download the audio to hear it ma'am.

Harikesh

2020-08-20 04:20:58 UTC

"Whether house hold supply voltage in other countries is different as in India."

YUGANDHARA.J

2020-08-20 04:45:46 UTC

" Whether house hold supply voltage in other countries is different as in India "
Both India and US distribute 240 volts to households. However, the 240 volt residential service in US is in the form of two 120 volt conductors and a neutral conductor. When a load is applied from either 120 volt conductor to the neutral, it is using 120 volts.However, when a load is applied from one 120 volt conductor to the other, without using the neutral, the voltage being used is the sum of both 120 volt conductors (240 volts). So, the essential difference lies in the receptacles of the two systems. One common reason is that low voltages tend to be safer. Higher voltage is somewhat more dangerous if there is a short circuit or if they are accidentally touched. Some experienced electricians are relatively casual about touching 110 V circuits, but 230 V is highly respected.

LIKITHA B

likitha — 2020-08-20 04:59:29 UTC

"Whether house hold supply voltage in other countries is different as in India."

Vijesh

2020-08-20 05:01:40 UTC

"Wheather house hold supply voltage in other countries is different as in india "

Kavya

kavya01 — 2020-08-20 05:19:00 UTC

Download the audio to hear mam.

SHRIYAA S K

shriyaa02 — 2020-08-20 05:37:40 UTC

"Whether house hold supply voltage in other countries is different as in India."

Nishaanth.K

2020-08-20 05:45:20 UTC

Whether house hold supply voltage in other countries is different as in India.

R.Reshma Dharunika

reshmanica — 2020-08-20 06:39:56 UTC

Why is the household voltage not the same throughout the world?
Please download the audio ma’am

Ahalya

ahalya01 — 2020-08-20 08:17:12 UTC

Whether household supply voltage in other countries ia different as in india:
The voltage in India is 220 volts, alternating at 50 cycles (Hertz) per second. This is the same as, or similar to, most countries in the world including Australia, Europe and the UK. However, it's different to the 110-120 volt electricity with 60 cycles per second that's used in the United States for small appliances.

Samyuktha

Samyuktha27 — 2020-08-20 11:07:13 UTC

Whether house hold supply voltage in other countries is different as in India."
There’s a good reason behind that too. Consider India (230 Volts) and the United States (120 Volts) as an example. If the voltage is low, the amount of current passing through to produce the same amount of power is more. Therefore, there’s a lower risk of getting injured if one happens to come in physical contact with an unprotected live wire (as the voltage is low), but there are greater energy losses (as the current is high, resistance is high too). In countries having higher voltages, energy losses are lower, but the risk of sustaining injuries is much higher.

SHRIYAA.S.K(08-09-2020)

shriyaa02 — 2020-09-08 02:40:18 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?

Father: If we don't have earthing in our home then the current (neutral and fuse wire) affects flow of blood in our body.Earthing is a protector of our body in our home.
* gives Protection against electrical overload.
*Having your electrical system grounded means you will be making it easy for power to be directed straight to wherever you need it, allowing electrical currents to safely and efficiently travel throughout your electrical system.
*Stabilizes the voltage levels
Mother:same

S.Ratnesh<8.9.2020>

ratnesh021 — 2020-09-08 03:07:40 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?

Father- Earthing is used to protect us from an electric shock.The earthing provides the simple path to the leakage current.

Mother- Earthing provides a path for a fault current to flow to earth.The earthing provides the simple path to the leakage current to the earth

B.Vijesh [8.9.20]

vijesh02 — 2020-09-08 03:12:43 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?
MOTHER :The process of transferring the immediate discharge of the electrical energy directly to the earth by the help of the low resistance wire is known as the electrical earthing.
BROTHER : Mostly, the galvanised iron is used for the earthing. The earthing provides the simple path to the leakage current.

Nithya Shree ( 8.9.2020)

nithyagm2000 — 2020-09-08 03:28:25 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?
Father - The earth wire gives a safe route for the current if the live wire touches the outer casing.
Mother -To avoid the risk of electric shocks , the metal body of an electrical appliances is earthed.
Earthing means to connect the metal case of electrical appliances to earth at zero potential by means of earth wire.

Likitha B

2020-09-08 03:33:20 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?

Father-a static control system or lightning protection system is connected to an earth network or independent earth network.

mother- direct contact with the earth where electricity is passed in a revolutionary direction is called earthing.

YUGANDHARA.J (8.9.20)

2020-09-08 03:55:44 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?
FATHER AND MOTHER:
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault. Main purpose of earthing is given below:
*It keeps people safe by preventing electric shock.
*It prevents damage to electrical appliances and devices by preventing excessive current from running through the circuit.
*It prevents the risk of fire that could otherwise be caused by current leakage.

Kavya

kavya01 — 2020-09-08 04:23:49 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?
FATHER- Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.
MOTHER-A 2.5 metre deep pit is dug into the ground and a Galvanised Iron (GI) plate is placed inside along with charcoal and sand for the purpose of maintain low resistance around the plate. An earth wire, which is of GI or tinned copper, is bolted to the plate before burying it by means of nuts, bolts and washers.

SHIVANJALI. S (8.9.2020)

shivanjali01 — 2020-09-08 04:28:57 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN" WHAT IS EARTHING AND ITS USES IN HOUSE WIRING"

FATHER- earthing is used to protect us from electrical shock. The electrical earthing is done by connecting the non-current carrying part of the equipment or neutral of supply system to the ground.
MOTHER- The earthing provides the simple path to the leakage current. The short circuit current of the equipment passes to the earth which has zero potential. Thus, protects the system and equipment from damage.

Harikesh

2020-09-08 04:31:19 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?

My views :
Earthing it the process of connecting the outer exposed part of the metal circuit to the ground to prevent us from a "SHOCK".

My Mother:
Earthing is the electrical process of connecting the live wire to the ground to prevent the electrical shock.
An earthing system or grounding system connects specific parts of that installation with the Earth's conductive surface for safety and functional purposes

My Father:
Earthing is the process of transferring the immediate discharge of electricity directly to the earth plate, by means of low resistance electrical cables or wires. Earthing is used to protect you from an electric shock. The things required for earthing are:
Earth electrode (rods, tapes etc.)
Main earthing terminals or bars.
Earthing conductors.
Protective conductors.
Equipotential bonding conductors.
Electrically independent earth electrodes for special systems (clean earth)

My brother:
Earthing is the process of connecting the circuit to the ground to prevent a shock.

R. MIRUTHULLA VAANI

2020-09-08 06:02:01 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?

MY MOTHER :

EARTHING IS USED TO PROTECT US FROM ELECTRICAL SHOCKS.
THERE IS AN REAL TIME EXAMPLE IN OUR HOUSE :

FRIDGE : WHEN WE TOUCH THE HANDLE OF THE FRIDGE , WE GET SHOCKS MANY TIMES , TO PREVENT THIS , WE USED HOUSE WIRING .

IT SHOULD BE DONE IN EACH AND EVERY HOUSES TO AVOID RISKS.

MY FATHER :

EARTHING IS AN FAULT IN THE ELECTRICAL INSTALLATION , WE WOULD GET AN ELECTRIC SHOCK WHENEVER WE TOUCH AN METAL PART. EARTHING IS USED TO PROTECT US FROM THE ELECTRIC SHOCK. IT DOES BY PROVIDING AN PATH FOR THE FAULT CURRENT TO FLOW TO EARTH. EARTHING IS DONE MOSTLY IN UNDERGROUND. AN IRON PLATE IS PLACED INSIDE THE GROUND WITH ADDED CHARCOL AND SAND . AN EARTH WIRE , WHICH IS OF TINNED COPPER IS BOLTED TO THE PLATE BEFORE BURYING IT .

BROTHER :

EARTHING IS AN CONTACT WITH EARTH SURFACE. IT IS THE PROCESS OF ELECTRIC WIRING TO PREVENT SHOCKS.
IT IS DONE IN UNDERGROUND. IT SHOULD BE DONE IN EVERY HOUSE TO AVOID RISKS.

THANK YOU ............

Ahalya

ahalya01 — 2020-09-08 06:18:55 UTC

TAKE A SURVEY IN YOUR FAMILY ABOUT THEIR UNDERSTANDING IN "WHAT IS EARTHING AND ITS USES IN HOUSE WIRING "?

Father and mother - Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.

Prisha

prisha8 — 2020-09-08 06:43:33 UTC

I have summed up the data collected through the survey in the following points :

◆ Because of short circuit, excess of current flows through the wires.

◆ This causes heating up of wire, and this might lead to accidents.

◆ So it is necessary to let the excess current flow into the Earth through the Earth wire.

◆ In the absence of Earth wire, there is a risk of shock.

◆ Since soil is a bad conductor of electricity, it absorbs the current and saves us from risks.

SURVEY ON EARTHING

2020-09-08 06:59:18 UTC

Views of my parents:
Its an electrical installation, an earthing system or grounding system connects specific parts of that installation with the Earth's surface for safety and functional purposes.
If the house is not earthed, people could get electrocuted. Without an earth connection, the safety switches will not work and an electrical fault could cause a house or appliances to become 'live' as the current flows to earth
-Devadharshini

R.Reshma Dharunika

reshmanica — 2020-09-08 06:59:48 UTC

From the survey, I have reviewed the term Earthing and its significance.

Earthing is done in order to prevent us from getting electrocuted. We might get an electric shock from the live wire if there is a fault in any electrical appliance, but no more if the wires are already earthed to the ground.

When the live wire is earthed, the current passes to the ground instead of passing through whomever touches it.

PAVITHRA.K

pavithra01 — 2020-09-08 11:54:59 UTC

Earthing is used to protect us from an electric shock. It does this by providing a path for a fault current to flow to earth. It also causes the protective device to switch off the electric current to the circuit that has the fault.
The earthing protects the personnel from the short circuit current.
The earthing provides the easiest path to the flow of short circuit current even after the failure of the insulation.

RP.SUJAY KRISHNA

sujaykrishnab2w — 2020-09-08 13:05:41 UTC
SURVEY ON EARTHING:MY PARENTS SAID THAT EARTHING IS CONNECTION OF WIRE TO THE THE GROUND TO PREVENT THE ELECTRICAL SHOCK.MY MOTHER SAID IT WITH A REAL LIFE EXAMPLE THAT WHEN SHE TOUCHED THE METAL TAP WHEN THE WATER HEATER WAS ON SHE GOT THE ELECTRICAL SHOCK AND MY FATHER CALLED THE ELECTRICIAN TO RECTIFY THE PROBLEM AND THEY RECTIFIED THE PROBLEM BY GIVING A EARTHING WIRE TO THE GROUND.

Harikesh.C

2020-10-15 04:28:01 UTC

Homefun for October 14

Kavya

kavya01 — 2020-10-15 05:13:01 UTC

Refraction of light by lens.

Vijesh

vijesh02 — 2020-10-15 06:22:33 UTC

Construction of ray diagram for a lens (15.10.20)

S.Ratnesh

ratnesh021 — 2020-10-15 07:06:04 UTC

Construction of ray diagram for a lens (15.10.20)

Prisha

prisha8 — 2020-10-15 07:28:39 UTC

Ray diagram - 15th October homework

2020-10-15 08:57:14 UTC

Sri Dhurga
October -15th homework
Ray diagram for concave lens

Samyuktha

samyuktha01 — 2020-10-15 10:35:45 UTC

Construction of ray diagram

G.NITHYA SHREE

nithyagm2000 — 2020-10-15 14:22:40 UTC

shivanjali

shivanjali01 — 2020-10-15 15:06:00 UTC

October 15, 2020
Concave lens construction.

ruben

2020-10-15 16:03:17 UTC

construction of ray diagram

S.Ratnesh

ratnesh021 — 2020-10-16 04:48:12 UTC

(16.10.2020)

Ahalya

ahalya01 — 2020-10-16 05:21:57 UTC

Ray diagram

Vijesh

vijesh02 — 2020-10-16 06:26:48 UTC

(16.10.20)

Vijesh

vijesh02 — 2020-10-16 06:27:40 UTC

(16.10.20)

Prisha

prisha8 — 2020-10-16 10:02:50 UTC

16th October

Prisha

prisha8 — 2020-10-16 10:03:28 UTC

16th October

Prisha

prisha8 — 2020-10-16 10:03:53 UTC

16th October

G.NITHYA SHREE

nithyagm2000 — 2020-10-16 12:14:38 UTC

G.NITHYA SHREE

nithyagm2000 — 2020-10-16 12:15:15 UTC

G.NITHYA SHREE

nithyagm2000 — 2020-10-16 12:15:48 UTC

Shriyaa S K

shriyaa02 — 2020-10-16 13:19:53 UTC

OCt-15-2020

S.Harish Rubenshree

2020-10-16 15:21:35 UTC

Oct 16th 2020

Ruben

2020-10-16 15:24:32 UTC

oct 16th 2020

Samyuktha

samyuktha01 — 2020-10-16 16:21:14 UTC

October 16th homework

Samyuktha

samyuktha01 — 2020-10-16 16:27:32 UTC

October 16th homework

Ahalya

ahalya01 — 2020-10-16 16:42:11 UTC

Ahalya

ahalya01 — 2020-10-16 16:43:11 UTC

my answer to the riddle

shririsi2005 — 2020-11-03 02:57:19 UTC

my answer to the riddle

Kavya

kavya01 — 2020-11-03 03:11:56 UTC

Answer for the riddles:
Complete this series of numbers:
9 = 4,
21 = 9,
22 = 9,
24 = 10,
8 = 5,
7 = 5,
99 = 10,
100 = 7,
16 =?,
17 =?
16=7
17=9

S.Ratnesh

ratnesh021 — 2020-11-03 03:14:00 UTC

9 = 4,
21 = 9,
22 = 9,
24 = 10,
8 = 5,
7 = 5,
99 = 10,
100 = 7,
16 =?,
17 =?
Convert the numbers into alphabets
9(nine)=4
21(twenty one)=9

16(sixteen)=7
17(seventeen)=9

Sujay Krishna

sujaykrishnab2w — 2020-11-03 03:33:34 UTC

9 = 4,
21 = 9,
22 = 9,
24 = 10,
8 = 5,
7 = 5,
99 = 10,
100 = 7,
16 =?,
17 =?
Convert the numbers into alphabets
9(nine)=4
21(twenty one)=9

16(sixteen)=7
17(seventeen)=9

R.Reshma Dharunika

2020-11-03 04:11:31 UTC

9=4
21=9
22=9
24=10
8=5
7=5
99=10
100=7
Sixteen= 7
Seventeen = 9

C.Harikesh

2020-11-03 04:31:10 UTC

9 = 4,
21 = 9,
22 = 9,
24 = 10,
8 = 5,
7 = 5,
99 = 10,
100 = 7,
16 =?,
17 =?
Convert the numbers into alphabets
9[nine] = 4 - 4 letters
21[twenty one] = 9 - 9 letters
24[twenty four]= 10 - 1O letters

Answer:
16[sixteen]=7
17[seventeen]=9

LIKITHA B

likitha — 2020-11-03 05:09:45 UTC

9=4
21 = 9,
22 = 9,
24 = 10,
8 = 5,
7 = 5,
99 = 10,
100 = 7,
16 =?,
17 =?
ANSWER:
16=7
17=9

R.Reshma Dharunika

2020-11-03 05:36:37 UTC

9=4
21=9
22=9
8=5
7=5
99=10
11=7
Sixteen= 7
Seventeen= 9

Vijesh B

vijesh02 — 2020-11-03 08:39:20 UTC

16 = 7
17 = 9

G.Nithya Shree

2020-11-03 11:10:38 UTC

9 = 4,
21 = 9,
22 = 9,
24 = 10,
8 = 5,
7 = 5,
99 = 10,
100 = 7,
16 =?,
17 =?
Answer
No. 16 has 7 letters so 16 = 7
No. 17 has 9 letters so 17 = 9

G.Nithya Shree

2020-11-09 10:44:36 UTC

10 /11/2020
Can you see the glowing filament inside? Why does the element glow?
Yes . The filaments are so thin that they glow red hot when the electricity flows through them. Like a series of small radiators, the filaments beam heat toward the bread in the toaster
What is the useful output energy in this system?
Heat energy
What is the wasted output energy in this system?
Electrical energy

Shriyaa S K

shririsi2005 — 2020-11-10 02:46:13 UTC

10-11-2020

S.Ratnesh

ratnesh021 — 2020-11-10 03:26:47 UTC

10.11.2020

Can you see the glowing filament inside? Why does the element glow?
Yes the glowing filament can be seen. The element glows to toast the bread with the conversion of electrical energy to heat energy.

What is the useful output energy in this system?
Heat energy is the useful output energy.

What is the wasted output energy in this system?
light energy is the wasted output energy.

Kavya

kavya01 — 2020-11-10 03:42:23 UTC

Can you see the glowing filament inside? Why does the element glow?
Yes. I can see the glowing filament inside. This filament inside converts the electrical energy to heat energy.
2.What is the useful output energy in this system?
The useful output energy is heat energy.
3.What is the wasted output energy in this system?
The wasted output energy is the electrical energy.

Vijesh 10.11.20

vijesh02 — 2020-11-10 04:43:57 UTC

1.Can you see the glowing filament inside? Why does the element glow? .
yes. The filament converts electrical to heat energy

2.What is the useful output energy in this system?

useful output energy = heat energy

3.What is the wasted output energy in this system?
wasted output energy = electrical energy

Samyuktha

samyuktha01 — 2020-11-10 05:25:27 UTC

10/11/2020

1. Can you see the glowing filament inside? Why does the element glow?
Yes, It glows due to the heat.

2. What is the useful output energy in this system?
Light from the glowing element, thermal energy of toaster case and air around it.

3. .What is the wasted output energy in this system?
The wasted energy for a toaster is the light of the heat inside the toaster, thermal energy to the surroundings wasted.

Likitha B

likitha — 2020-11-10 05:27:57 UTC

1. Can you see the glowing filament inside? Why does the element glow?
yes. As the electricity flows, the electrons jostle about and collide with one another, and with the atoms in the metal wire, giving off heat in the process.
2.What is the useful output energy in this system?
heat energy,electrical energy,light energy.The atoms inside the metal wire are being heated up by the electrons flowing through it. They're absorbing some energy as heat, becoming unstable, and then giving off some of the energy as light to try to become stable again.
3.What is the wasted output energy in this system?
heat energy.because all the machines don't have a 100% efficiency. The battery inside the toaster gets heated and there will be about 20% of loss in its efficiency.

Rutheeshtaa.Su

2020-11-10 05:36:30 UTC

10/11/2020
1. Can you see the glowing filament inside? Why does the element glow?
Yes, I can see the glowing filament ,it glows because of heat energy.

2. What is the useful output energy in this system?
Heat energy

3. .What is the wasted output energy in this system?
light energy

Harikesh

2020-11-10 06:24:38 UTC

10/11/2020
1. Can you see the glowing filament inside? Why does the element glow?
Yes, I can see the glowing filament ,it glows because of heat energy. The energy produced in the filament glows

2. What is the useful output energy in this system?
The output energy in the system is Heat energy

3. .What is the wasted output energy in this system?
The wasted output energy in the system is light energy

Sujay Krishna

sujaykrishnab2w — 2020-11-10 06:58:49 UTC

1. Can you see the glowing filament inside? Why does the element glow?
Yes, I can see the glowing filament ,it glows because of heat energy. The energy produced in the filament glows

2. What is the useful output energy in this system?
The output energy in the system is Heat energy

3. .What is the wasted output energy in this system?
The wasted output energy in the system is light energy

Ahalya

ahalya01 — 2020-11-10 08:14:41 UTC

1. Can you see the glowing filament inside? Why does the element glow?
Yes i can see the glowing filament.The glowing filament glows because of the heat energy produced by it.
2. What is the useful output energy in this system?
The useful output energy is light energy.
3. .What is the wasted output energy in this system?
Heat energy .

R.Reshma Dharunika

2020-11-10 08:35:43 UTC

1. Can you see the glowing filament inside? Why does it glow?
Of course I can see the light glowing. That’s because of the flow of current and energy through it.
2. What is the useful output energy in this system?
The useful output energy is the heat energy, as for a toaster it’s purpose is to toast the bread.
3. What is the wasted output energy in this system?
The wasted energy is light energy as it’s got no use in this mechanism.
Thank you

Prisha

2020-11-10 08:59:07 UTC

1. Yes, I can see the glowing filament. It glows because of the light produced by the heat.
2. Heat energy is the useful output energy.
3. Light energy is the wasted output energy.

Devadharshini

2020-11-10 09:26:31 UTC

1. Yes, the filament glows because of the heat produced by it.
2. The useful output is heat energy.
3. The wasted output is light energy.

Annamalai.G

annamalaiakash999 — 2020-11-10 11:35:40 UTC

1. Yes , it glows because of flow of the heat.
2.Heat energy is useful output.
3.Light energy is wasted output.

MIRUTHULLA VAANI.R

2020-11-10 12:19:01 UTC

( 10 . 11 . 2020 )

1. Can you see the glowing filament inside? Why does the element glow?
Yes i can see the glowing filament.The glowing filament glows because of the heat energy produced by it.
2. what is the useful output energy in this system ?
The heat energy is the useful output energy.
3. what is the wasted output energy in this system ?
Light energy is the wasted output energy .

Nishaanth.K

2020-11-10 15:56:31 UTC

1.Yes,The filament glows because of flow of heat
2.Heat energy
3.Light energy

Dear students, happy to see that many of you have tried answering today in padlet,

sowmyaananth53 — 2020-11-11 11:25:50 UTC

1. Can you see the glowing filament inside? Why does the element glow?
The electric current passes through the toaster and the element has a high resistance. Energy is transferred to the particles in the element so that they gain kinetic energy and the temperature of the wire increases. Some of the energy is also transferred as light to the surroundings and the wire glows.
2. what is the useful output energy in this system ?
Heat.
3. what is the wasted output energy in this system ?
light

these are the answers for those questions,

Thank you,
Sowmya

Annamalai.G 19/11/2020

annamalaiakash999 — 2020-11-19 02:40:27 UTC

Power rating of common current appliances:
Generally electrical appliances are rated with its power and voltage.From rating the electrical appliances we can calculate two quantities:
i) Resistance of filament or element when it is in use,
ii) The safe limit of current which can flow through the appliance while in use.

S.Ratnesh

ratnesh021 — 2020-11-19 03:54:07 UTC

1. An electric appliance such as electric bulb, geyser, heater etc. is rated with its power and voltage

2.From rating the electrical appliances we can calculate two quantities:
i) Resistance of filament or element when it is in use,
ii) The safe limit of current which can flow through the appliance while in use.

3.P=V^2 / R

4.R=V^2/P

5.I=P/V

B.Vijesh

vijesh02 — 2020-11-19 04:24:03 UTC

1. An electrical appliance is rated with its power and voltage.
2. from rating of an appliance, we can get :
- resistance
- safe limit of current
3. R =V2/P
4. I=P/V
5. The unit in which consumer pays the cost of electrical energy is kWh

YUGANDHARA.J

2020-11-19 04:47:59 UTC

Power rating of common electrical appliances :
1. Generally an electrical appliance such as electric bulb, geyser, heater, etc. is rated with its power and voltage. Each appliance gets connected to 220V supply for its normal working.
2. Quantities for rating of an appliance:
* The resistance of its filament or element when it is in use.
* The safe limit of current which can flow through the appliance while in use.
3. The electrical power of a given device is simply the rate at which electrical energy is being connected by it. P = V2/R.
Resistance of element of the appliance while in use, R = V2/P
4. The safe limit of current flow the electrical appliance, I = P/V.

Kavya

kavya01 — 2020-11-19 05:25:06 UTC

Power rating of common electrical appliances:
The resistance of the filament when in use can be calculated.
The common electrical appliances are rated with power and voltage.
If the current exceeds the value the voltage also exceeds.
The value of current is called safe current.
It can calculate the safe limit of current which flows through the appliance when in use.

An electrical appliance is rated by power and voltage. If bulb has 100W- 220 volt the bulb consumes the power 100W. The rating of an appliance depends on 1- Amount of safe current which can flow thriugh the apploance. 2- The resistance of yhe filament or the element when in use. I=P/V. R=V*V/P.

2020-11-19 05:39:07 UTC

By Kashyap R.T Gopal

Miruthulla vaani. R

2020-11-19 05:48:40 UTC

Every electrical appliance has a power rating which tells you how much electricity it needs to work.

This is usually given in watts (W) or kilowatts (kW) (1000W = 1kW). Of course, the amount of electricity it uses depends on how long it’s on for, and this is measured in kilowatt-hours (kWh).

Electricity is sold by the kilowatt-hour (kWh) – usually referred to as ‘units’ on your electricity bill. We’ve done some of the work for you, but if you’re feeling mathematical you can work out how much your own appliances cost to run by multiplying their wattage by the amount of time they’re on and then by the cost of electricity per kWh. So let’s say you have a 500W (0.5 kW) dehumidifier and you run it for a whole day (24 hours). It will use 12kWh of electricity (e.g. half a kilowatt every hour). If your electricity costs 15p per unit, then multiply 12kWh by 15p and you get a grand total of 180p, or £1.80. This is what it costs to run the dehumidifier all day, and you can see how appliances can add a lot to your bills.

Power rating of common electrical appliances:

devadharshini016 — 2020-11-19 05:59:47 UTC

● an electrical appliance is rated with its power and voltage.
● by rating an appliance we can calculate :
Resistance of its filament when in use and safe limit of current flow while using.
● if the current exceeds the value, the power supplied at voltage V will exceed the rated power of the appliance and may damage it

Prisha

2020-11-19 06:27:04 UTC

Power rating of common electrical appliances:
Appliances are rated with power and voltage.
By ratings, we can calculate the resistance of its filament, and the safe limit of current flow.
Ratings are made available for appliances such as bulb, geyser, refrigerator etc.

Sujay Krishna

sujaykrishnab2w — 2020-11-19 06:41:55 UTC

Power Rating of Common Electrical Appliances:
#.The resistance of its filament or element it is in use
#.The safe limit of current which can flow through the appliance while in use

Harikesh

2020-11-19 06:52:19 UTC

Power rating of common electrical appliances:
Every electrical appliance has a power rating which tells you how much electricity it needs to work...
This is usually given in watts (W) or kilowatts (kW) (1000W = 1kW). Of course, the amount of electricity it uses depends on how long it's on for, and this is measured in kilowatt-hours (kWh)...
The power rating of an appliance determine the cost of money in which we use it...
Some examples of rating of electric current is avaliable in these devices such as...
Electric shower
Immersion heater
Kettle
Tumble Dryer
Electric fire
Oven
Hairdryer
Oil-filled radiator
Washing machine

Samyuktha

samyuktha01 — 2020-11-19 09:34:33 UTC

Power rating of common electrical appliances...

1. Quantities calculated from rating of appliance –
The resistance of its filament or element when it is in use
The safe limit of current which can flow through the appliance
2. R = (voltage rating on the appliance)^2 / power rating on the appliance

3. Safe current = power rating on the appliance / voltage rating on the appliance

19-nov-2020

shririsi2005 — 2020-11-19 10:14:57 UTC

Power rating of common electrical appliances...
1. Every electrical appliance has a power rating which tells you how much electricity it needs to work...
2.Some examples of rating of electric current is available in these devices such as...
Electric shower
Immersion heater
Kettle
Tumble Dryer
Electric fire
Oven
Hairdryer
Oil-filled radiator
Washing machine

R=(voltage rating on the appliance)2 /power rating on the appliance.

Power rating of common electrical appliances:

ahalya01 — 2020-11-19 10:51:59 UTC

Electric appliances are generally rated with power and voltage
The resistence of its filament or element when it is in use.
The safe limit of current which can flow through the appliance while in use.

Parkkavi.k

2020-11-19 11:23:19 UTC

Power rating of common electrical appliance..

Electrical appliance are generally rated with its power and voltage.
By calculating we get to know about its filament and the safe limit of current.
SOME EXAMPLES:
oven
washing machine
refrigerator
hair dryer
kettle

Shree Sanjeya. RG

2020-11-19 12:34:46 UTC

Power rating of common electrical appliance:

An electric appliance is rated with its power and voltage. By the rating of an appliance we can calculate the resistance of its filament or element when it is in use and the safe limit of current which can flow through the appliance while in use.
Some examples are: electric bulb, heater, geyser etc.

R.Reshma Dharunika

2020-11-19 13:54:21 UTC

Electrical appliances are rated with its power and voltage. From the rating we could find,
1. Resistance of the filament.
2. Safe limit of the current to flow in the appliance.

When current exceeds the rated power of the appliance, it may fuse/damage.

S.Harish Rubenshree

2020-11-19 15:06:41 UTC

Power rating of common electrical appliance...
1.The resistance of its filament or element it is in use
2.The safe limit of current which can flow through the appliance while in use
Electricity is sold by the kilowatt-hour (kWh) – usually referred to as ‘units’ on your electricity bill. We’ve done some of the work for you, but if you’re feeling mathematical you can work out how much your own appliances cost to run by multiplying their wattage by the amount of time they’re on and then by the cost of electricity per kWh.
Some examples:
oven
washing machine
electric shower
hair dryer
immersion heater

RASMIKA.S

2020-11-19 15:16:33 UTC

An electric appliance is rated with its power and voltage. From the rating appliance we can calculate the following:
1) The resistance of its filament or element when it is in use.
2) The safe limit of current which can flow through the appliance while in use.
Incase the current exceeds the rated power of the appliance, the appliance will get damaged.

Nishaanth.K

2020-11-19 15:19:42 UTC

Power rating of common electrical appliances

ApplianceWatts
Water Heater – Electric | 4500
Window Air Conditioner 10,000 BTU NA | 900
Window Air Conditioner 12,000 BTU NA | 3250
Well Pump – 1/3 1HP | 750

James Deva Singh

2020-11-19 15:54:27 UTC

Power rating of common electrical appliances
Electric* 4000
Gas Heated 300 - 400
Electric Blanket 200
Electric Clock 1
Electric Frying Pan 120
Laptop 20 - 75
Desktop PC 80 - 200
Printer 100
Coffee Maker 800
Clock Radio 1
Dishwasher 1200 - 1500

Ln-Sound(20-nov-2020)

shririsi2005 — 2020-11-20 02:27:44 UTC

Sound from different bowls are different due to is frequency difference between bowls.
this is my experience i have attached it below

Nithya Shree .G

2020-11-20 07:14:15 UTC

Ln - Sound
The sound that i heard from the bowls filled with water made a music. The sound vibration that i heard from every bowl vary. It heard like xylophone.