All Questions
91
questions
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97
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Does the Conventional Current flow consist out of anything? (virtual photons)
I've red that virtual photons are a way of interpreting the electromagnetic force between charged particles. Is convention current a electromagnetic field or force? Or is it a movement of ...
- 15
0
votes
1
answer
197
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What is electric current? [closed]
I have been reading a book about electricity which states that: electric current is not the movement of electrons but the "impulse generated when free electrons orderly "jump" from one atom to the ...
- 11
0
votes
0
answers
770
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Why, when using an ammeter in a circuit powered by DC, does the current sometimes read as negative?
Conventional current is the rate of flow of charge, defined as:
$$I=\frac{\Delta Q}{\Delta t}$$
$\Delta t$ can only ever be positive, so for $I$ to be negative $\Delta Q$ must be negative.
However, ...
- 1,307
0
votes
1
answer
1k
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IF electrons flow in opposite direction to the electric current then what constitutes the current?
If electrons flow to the opposite direction to the electric current and the protons do not move instead they create the current, then what actually flows in the electric current? Since current is flow ...
3
votes
2
answers
1k
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How is the speed of electricity determined?
Before I am told this is a duplicate, I'd like to be specific here. I have searched online for an answer regarding the speed of electricity in general and haven't found what I'm looking for. Even in ...
5
votes
2
answers
695
views
Why do electrons follow the conductors shape?
I'm stuck thinking about this situation. I imagine that there are two oppositely charged objects at short distance $r$, put inside an insulator (Can I say air?). They generate a net elctric field, ...
3
votes
2
answers
1k
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Do different parts of body conduct current in different ways?
When we touch anything(with small amount of current), like the end of our CPU cabinet, with our hands, it does feel like a small current is flowing through.But the same doesn't occur when touch the ...
- 69
1
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1
answer
126
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Please tell me that why aren't we discarding the conventional flow of current despite not being in sync with principle of potential difference [duplicate]
electric current flows from higher potential area (negative terminal) to lower potential area (positive terminal).this clearly indicates that electric flow (flow of electrons) takes place from ...
- 109
0
votes
0
answers
52
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What happens if an electrical current has two paths of unequal length?
Suppose I connect one 1 km cable and one 1000 km cable to the same pole of a power source and also connect them together at the other end. Suppose (theoretically) the longer cable has the exact same ...
- 101
2
votes
3
answers
36k
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Direction of current and direction of flow of electrons
My textbook says that the flow of current is from the positive to negative and my notebook say that the flow of electrons is from negative to positive.
Why aren't they agreeing on one direction? Who ...
- 29
0
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1
answer
542
views
How to measure residual charge in capacitor?
I understand how to measure capacitance of capacitor with multimeter but it is possible to measure residual charge of "half-discharged" capacitor?
- 185
2
votes
2
answers
736
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Where do the electrons come from in DC generator
I understand that electrons are not created nor destroyed. In AC voltage the electrons are oscilating back and forth in material. But I cannot understand where do the electrons come from that are ...
- 185
1
vote
3
answers
2k
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Is a Coulomb a count electrons or a measure of current?
In "Is electricity instantaneous?" there were several answers that differentiate between 'electron flow' and 'current flow': electrons move slowly through a conductor, but the resulting current moves ...
- 61
0
votes
2
answers
618
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How can Current be positive when electrons have a negative charge?
I am a little confused. I have been told that electrons carry a charge of $-1.6 \cdot 10^{-19}$ coulombs, and that 1 coulomb is $6.25 \cdot 10^{18}$ electrons, and $1 \,\mathrm{A}$ is the current from ...
- 11
3
votes
1
answer
525
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How do electrons move at an atomic level? [duplicate]
This was meant to be a sub question in the comments of my last question but I think it is big enough to have its own post.
I know that electrons move because of the potential difference across the ...
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