https://padlet.com/vnae113186/physics_summary Physics summary en-us 2016-08-12 05:22:53 UTC 2023-07-08 17:06:01 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Lightdecrease.png vnae113186 https://padlet.com/vnae113186/physics_summary/wish/118086205 electric current is the flow of electron along the connecting wires in a circuit.

• The electrons flow from negative to positive of the power supply.
• Conventional current direction is opposite to the flow of electrons- current direction is from positive to negative.
• Si unit of current is Ampere (A)

]]> 2016-08-12 05:31:18 UTC https://padlet.com/vnae113186/physics_summary/wish/118086205 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/118086330 2016-08-12 05:34:56 UTC https://padlet.com/vnae113186/physics_summary/wish/118086330 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/118086363 2016-08-12 05:35:41 UTC https://padlet.com/vnae113186/physics_summary/wish/118086363 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119036324 conventional current flows from positive to negative direction]]> 2016-08-21 05:46:41 UTC https://padlet.com/vnae113186/physics_summary/wish/119036324 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119036388 electrons flow from negative to positive direction]]> 2016-08-21 05:51:34 UTC https://padlet.com/vnae113186/physics_summary/wish/119036388 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119036462 2016-08-21 05:59:42 UTC https://padlet.com/vnae113186/physics_summary/wish/119036462 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119036511 good : most metals, including copper, silver, gold, steel

bad : polymers (such as perspex or polythene), minerals, glass, rubber ]]> 2016-08-21 06:04:03 UTC https://padlet.com/vnae113186/physics_summary/wish/119036511 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119036541 ammeter is a device that measures the electric current flowing in a circuit

it is always connected in a series]]> 2016-08-21 06:05:53 UTC https://padlet.com/vnae113186/physics_summary/wish/119036541 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119036584 current - rate of flow of charge
voltage - work done by the electron
emf - work done by the cell on electron to complete the circuit]]> 2016-08-21 06:08:04 UTC https://padlet.com/vnae113186/physics_summary/wish/119036584 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119076943 V = IR]]> 2016-08-22 01:37:12 UTC https://padlet.com/vnae113186/physics_summary/wish/119076943 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119077052 Definition
The electromotive force (e.m.f.) is defined as the energy per unit charge that is converted from chemical, mechanical, or other forms of energy into electrical energy in a battery or dynamo.

Symbol
Denote by the symbol, E.]]> 2016-08-22 01:38:25 UTC https://padlet.com/vnae113186/physics_summary/wish/119077052 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119077147 Definition
The potential difference (p.d.) between two points is defined as the energy converted from electrical to other forms when one coulomb of positive charge passes between the two points.

Symbol
Denote by the symbol, V]]> 2016-08-22 01:39:21 UTC https://padlet.com/vnae113186/physics_summary/wish/119077147 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119077350 Similarities:

• Have same unit (Volt)
• Can be measured by Voltmeter

]]> 2016-08-22 01:41:17 UTC https://padlet.com/vnae113186/physics_summary/wish/119077350 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119077595 The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. The inverse quantity is electrical conductance, and is the ease with which an electric current passes.

Unit of a resistance is measured in ohms.

R = V/I]]> 2016-08-22 01:43:46 UTC https://padlet.com/vnae113186/physics_summary/wish/119077595 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119077702 a voltmeter is a device used for measuring electrical potential difference between two points in an electrical circuit

it is always connected in parallel across a component]]> 2016-08-22 01:44:57 UTC https://padlet.com/vnae113186/physics_summary/wish/119077702 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119078893 2016-08-22 01:58:40 UTC https://padlet.com/vnae113186/physics_summary/wish/119078893 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119079080 2016-08-22 02:00:41 UTC https://padlet.com/vnae113186/physics_summary/wish/119079080 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119079106 2016-08-22 02:00:56 UTC https://padlet.com/vnae113186/physics_summary/wish/119079106 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119079324 - an analogue meter has a needle, which moves across a scale
- a digital meter gives a direct read-out in figures]]> 2016-08-22 02:03:35 UTC https://padlet.com/vnae113186/physics_summary/wish/119079324 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119079635 current (A) = charge(C)/time(s)

I = Q/t]]> 2016-08-22 02:06:38 UTC https://padlet.com/vnae113186/physics_summary/wish/119079635 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119079858 charge (C) = current (A) x time (s)

Q = It]]> 2016-08-22 02:08:36 UTC https://padlet.com/vnae113186/physics_summary/wish/119079858 vnae113186 https://padlet.com/vnae113186/physics_summary/wish/119079976 one ohm is one volt per lamp]]> 2016-08-22 02:09:38 UTC https://padlet.com/vnae113186/physics_summary/wish/119079976