# Questions tagged [electricity]

The study of the presence and flow of electric charge. Charges, currents, fields, potentials.

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### Does the Internal magnetic field inside of a current carrying conductor experience Lorentz force?

According to the most depictions of a Lorentz force I've found, Outer magnetic field of a wire reinforces the external magnetic field on the other side, and weakens it on the other, so the conductor ...
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### Will a generator turn a lamp on in open circuit if the lamp is connected to the earth which is greedy for electrons?

Consider the following thought experiment. One end of a lamp is connected to one terminal of a power generator. The other end of the lamp is connected to the ground via a metal copper as follows. ...
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### Electromagnetic field around a conductor with current

According to this video https://www.youtube.com/watch?v=bHIhgxav9LY I have a question: If the glowing of a light bulb is the result of energy supplied from the electromagnetic field around a conductor,...
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### How do I find the current density vector in an electromagnet that has a time-varying current?

I know that the current $I$ is a scalar quantity, and to calculate current density $J$ , the cross sectional area $A$ is needed, to give us $J = IA$ . $J$ also has other relations involving ...
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### How do I make 500-1000 kV dc voltage? [closed]

I found some inverters that turn 9v into 1,000,000 volts ac, but I need something that turns 9v dc into 1,000,000 volts dc. Is there anything that makes 1,000 kV dc>
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### What good reason to hang long cable carrying electric current high above the ground? [closed]

Assume no flooding or other natural disasters to damage the cable if it is laid beneath the ground, then what good reason for them to be suspended high above the ground? The cables are insulated and ...
33 views

### Creating an electric field

I'm trying really hard to finish making a Van de Graaff generator because I need an electric field to do a demonstration. I'm hoping it generates 500,000 volts. But I found some high volt generators ...
40 views

### Huge current flows when there is no resistance, consequently, the potential difference is 0 but no current flows if no cell is added to the circuit

If $R= 0$ , $V= 0$ and $I=$ $max$ (i.e. charges are flowing at a huge rate), but when there is no potential difference applied to a circuit, charges don't flow. That means huge current flows when ...
37 views

### Is potential difference required only to overcome resistance in a conductor?

In free space, a potential difference is required for the flow of a charge though there is no resistance. In a conductor, a potential difference is required only to overcome the resistance, am I right?...
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### Current and voltage in series combination of resistors

In a series combination of resistors , current through each resistors is same but, how is it possible for current to be same if all the resistors have different resistance . the current has to apply ...
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### Energy of each electron in a lightning bolt

I have read that lightning bolts have a difference of potential of 300 Mega Volts. Does it mean that the electrons in the cloud have an energy of 300MeV each? I found that astonishing since that ...
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### Electric current and potential difference

I have lots of doubts regarding electrical energy, electric current and voltage. I have tried to understand as much I can but every time I try to completely clear my concept, I encounter a dilemma! So ...
If two Hollow Spheres with radius $r_1$ and $r_2$ have charge $q_1$ and $-q_2$ in them respectively(charges are evenly distributed in the surfaces).The spheres are separated by a distance d .Now We ...