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Fill spaces with the given words (NB some words must be used more than once):

Electric current is the total amount of ......... passing through a wire over a period of ........  .

What gives to charges the energy to move is ............ , so called from the name of ....................................., the first scientist who understood the nature of electric potential .

He invented a cell exploiting the energy created by a chemical reaction between two ..................................., the first example of ...............   .

With his invention scientists could generate a ...........  flow of charges that is a ...............  ; we calculate it with charge over the period of time in which that charge passes through a ..................of wire. Conventionally currents go from the..................to the..................pole of a battery and ,if going through a metal, it can be calculated dividing voltage by ................. .

The potential energy of a battery is converted in what we need, the .......  of a bulb for instance.

.............. is the energy given by an electric device over a period of time ; in order to calculate .......... power we can use different formulas , one of them is that we can multiply ............. and ...............  .

time, battery, different metals,   charge, Alessandro Volta, light, voltage, positive, negative, power, resistence, section, current, steady

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Electric Current: Crash Course Physics #28

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Watch the video about Ampère's Law and answer to the following questions:

1) What's the meaning of circuitation? What's the mathematical tool we generally need to calculate circuitation?

2)What's the constant mu_0 and what's its value?

3) What's the meaning of enclosed currents?

4)What's the statement of Ampère's law?

5) What's the difference between magnetic and electric field stated by Ampère's law?

5) What's a solenoid and why do we consider it?

6) What's the formula of the field inside a solenoid?

7) How does an electric engine work?

8) Why a solenoid can be drawn with a north pole and a south pole?

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Questions

1) What's a capacitor and what's its main use?
2) What's a capacitor formed of?
3) How can we store charges on a capacitor?
4) How much charge is there on the negative plate if the charge on the positive plate is +10 C ?
5) Can the two metal plates touch ? Why?
6) Is it true that a charged capacitor deals also with energy? Explain the connection?
7) What is Capacitance? Can we change a capacitor's Capacitance by increasing the charge on its plates?
8) How can we change the Capacitance of a capacitor?

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Capacitors and capacitance | Circuits | Physics | Khan Academy

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fill gaps: (words :  left,  smoke, the same , stronger, side, one thousand , bundle, squeezed up, currents , attract ,  five , spreading apart, repelling  )

In the first scene of the video a ........... of wire is hanging from the top and we are informed that ........ are going to flow through the wires , all in ..........direction. The first value of current flowing through the wire is ................. Amps, then it turns into two, three and four thousands. We see that the bundle looks progressively ...............  . No doubt that the wires .......... each other while the current is flowing and the ............... the current, the stronger the attraction.
In the second sceene, a single wire hangs from the top in a way that the current flowing in the  ........ side of the wire goes in the opposite direction as the current flowing in the right ....... . Current is made to flow in the wire from five hundred Amps to .........  thousands  and the two sides are more and more ............... ........... The two rods are clearly ................  one another. In the end a little ........... appears, perhaps current has gone too far!

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1)  What's the rule about currents flowing in and out a node? And about the sum of currents flowing into a node?

2) What's the physical quantity whose conservation is stated in this law?

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Kirchhoff's current law | Circuit analysis | Electrical engineering | Khan Academy

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1) What's the meaning of voltage rises and voltage drops?

2) What's the relationship between voltage rises and voltage drops in a loop? And what about the sum of all the differences in voltage?

3) What's the law of conservation stated in this rule?

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Kirchhoff's voltage law | Circuit analysis | Electrical engineering | Khan Academy

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In the circuit of the figure below determine the current

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Fill spaces: (hover, permeabilities, materials, oxygen, magnesium, electrons, loose,  water, different, diamagnetic, wood , field, paramagnetic, magnets)
Materials have ................... magnetic properties quantified by their magnetic ....................
Ferromagnetic ...................  are strongly affected by magnetic ........ and they become ............ themselsevs .
.................. materials , like ............ and  liquid ................ are slightly affected by magnetic fields and they .......... their magnetism once out of them.
Finally ................ materials , like
............ and ...............  behaves in opposition to the magnetic field and .............. over a magnet.
These properties are bound to the different behaviours of .................. in the different materials.

hover, permeabilities, materials, oxygen, magnesium, electrons, loose,  water, different, diamagnetic, wood , field, paramagnetic, magnets.

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1) What is the characteristics of the magnetic poles?
2) Is a static charge affected by a magnetic field? And a moving charge? Always?
3) What is the measuring unit of magnetic fields and from which units is it deriving from?

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Lorentz force law - 'F = q (V X B)' | Magnetic fields | Floatheadphysics

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1) What does the topic "Gauss's Law" recall?
2) Speaking about this new "Gauss's Law" , can we think that it's exactly the same as in Electrostatics?
3) In what sense Gauss's Law for magnestism expresses a fundemental property of magnets?
4) What is the measuring unit of magnetic flux?

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Watch the video and answer to the following questions:

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Watch the video and answer to the following questions:

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1) What is the role of wire n°1 in the first part of the video? And what the role of wire n°2?
2)What are the roles of the two wires in the second part of the video?
3)What is the overall effect? In which case there would have been a repulsion between the two wires?

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Magnetism (10 of 13) Magnetic Force Due to Parallel Wires, Current Same Direction

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1) The sentence"if a current creates a magnetic field then a magnetic field must in some ways create a current" reminds us something. What's your opinion?
2) Does a static magnetic field create a current?
3) Which kind of current do we produce exploiting electromagnetic induction?

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Watch the video and answer to the following questions:

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Watch the video and answer to the following questions:

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1)Which quantities   are involved to get the magnetic field of a single current wire?
2) Which quantities to calculate the field inside a solenoid?
3) Is there a common passage in the proofs of the two formulas?

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Ampere's Law & Magnetic Field of a Solenoid - Physics & Electromagnetism

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Energising Communities Project _ School Energy Efficiency

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Choose if the following sentences are True or False and explain

1) A charge at rest can create an electromagnetic wave     T      F

because ...........................................

2) The directions of fields in an em wave are perpendicular to the  velocity of the wave    T       F

because ....................................

3)The electromagnetic spectrum is part of the light spectrum  T     F

because ..................................

4) The wavelengtn of red-light is  shorter than the wavelength of blue light         T       F

because..........................................

5) X-rays are less dangerous then radio waves       T        F

because ...........................................

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Electromagnetic waves and the electromagnetic spectrum | Physics | Khan Academy

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Watch the video and answer to the following questions:

1)What was clear by the end of the XIX century?

2)What did  Maxwell discover?

3)Why was this discovery a problem in physics?

4)According to Einstein what's common between all observers , regardless their state of motion?

5) What's the consequence of the previous statement if we consider intervals of time?