All Questions
14
questions
0
votes
1
answer
158
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Propagation speed and capacitors charging speed of transmission line
I am a bit confused on the speed of voltage propagation in the transmission line and I hope someone can enlighten me. I understand the speed of step up voltage propagation is in the same order as the ...
- 1
1
vote
1
answer
240
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What is the total charge Q of 1 m³ of copper?
I was wondering if I can calculate the total charge Q of 1 m3 of copper, see my calculation in the picture below. Is this correct?
The correct solution (thanks to the community in the comments below):...
2
votes
0
answers
122
views
Is it possible to force charges into one plate of a capacitor?
As we know, a capacitor stores energy, but the net amount of charge in it doesn't change. If an electron enters one plate, another leaves the other plate. If the other plate is floating, the entering ...
-1
votes
5
answers
648
views
What does charge on an electron mean?
As I have read , charge is electrons , protons or neutrons.
Now , according to definition of current , current is the rate of flow of charge I.e flow of electrons. Then , I=Q/t . Unit of Q is coulomb &...
- 145
0
votes
2
answers
624
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How many newtons are there in one coulomb of charge?
Or, I should have said, how many newtons of force does one coulomb of charge exert? At a distance, presumably, of one meter? Since N/C is supposedly equivalent to V/m?
P.S. What are the values for a ...
- 231
6
votes
6
answers
8k
views
How can electricity be positive when electrons are negative?
I don't understand how can a for example a battery be positive charged when the electrons are negative charged? I've read that protons are positive but they can't move so are all electricity negative?
- 101
3
votes
2
answers
546
views
A question about electrons, charges and current
Let's talk about DC, a very simple circuit: a light bulb and a battery.
Some authors say that electrons move from negative to positive and current from positive from negative.
I always thought ...
- 847
6
votes
3
answers
8k
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Why does current have to return to its source in a circuit?
As far as I know there should be a current when a high potential point is connected to a low potential point, but apparently that is not true. I understand that a circuit must be closed in order for ...
- 69
1
vote
1
answer
2k
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Why is the positive side said to have a higher voltage than the negative side? [closed]
My question is, are textbooks just saying the positive side of a battery has a higher voltage because mathematically + is higher than - even when, in reality, there is nothing to come out of the ...
- 119
-2
votes
2
answers
3k
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electron flow discharging/charging battery [closed]
I understand that the electron flow is from the anode to cathode when discharging a battery but I don't understand why it is reversed for when charging a battery?
- 15
0
votes
5
answers
582
views
What does 'Voltage is the energy per particle' expressions mean?
I recently heard the expression that "Voltage is the amount of energy per electrical particle". I am confused about what it means. Isn't every particle have a certain amount of electrical energy?
How ...
- 803
1
vote
1
answer
4k
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How do laser printers produce the positive and negative charges on the paper?
I understand the general idea of how it works but I am a little confused on the actual details.
For instance I understand that the corona wire positively charges the entire drum and the laser then ...
- 11
0
votes
1
answer
682
views
Can an electron carry only one charge?
Sorry if this has been asked before. Could also be a really basic question (new to electrical study).
I am a bit confused about the relationship between electrons and charges. So what I understand is ...
- 211
2
votes
1
answer
251
views
Is there a limit on the charge that can flow in a wire?
I assume when I hook up a 12V battery to a wire, all the free electrons in the wire move. If I hook up 24V, they move faster so more charge passes a area cross section for i=C/s. But in AC, their ...
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