All Questions
Tagged with electricity electric-current
112
questions
78
votes
11
answers
56k
views
Why is the charge naming convention wrong?
I recently came to know about the Conventional Current vs. Electron Flow issue.
Doing some search I found that the reason for this is that Benjamin Franklin made a mistake when naming positive and ...
- 1,291
11
votes
1
answer
2k
views
High voltage power lines - clarification of energy loss
I've been having a bit of trouble understanding the high-voltage power lines. If I was sending power from $A \rightarrow B$, we have:
Ohm's law $V = IR$
Power lost in the form of heat $P = I^2 R$
...
- 914
6
votes
3
answers
2k
views
Why don't stationary charge feel force from a current carrying wire?
The current carrying wire doesn't apply any magnetic force on nearby charge $q$( positive stationary charge) because it has 0 velocity in lab frame. We found that there is no force on q by wire. But ...
- 79
14
votes
8
answers
110k
views
What causes an electric shock - Current or Voltage?
Though voltage and current are two interdependent physical quantity, I would like to know what gives more "shock" to a person - Voltage or Current? In simple words, will it cause more "electric - ...
- 157
16
votes
3
answers
121k
views
Why do birds sitting on electric wires not get shocked?
When we touch electric wires, we get shocked. Why don't birds sitting on electric wires not get shocked?
22
votes
6
answers
92k
views
In an alternating current, do electrons flow from the source to the device?
If electrons in an alternating current periodically reverse their direction, do they really flow? Won't they always come back to the same position?
- 221
11
votes
3
answers
5k
views
Why high voltage transmission lines?
This is a question which I seem to have tackled multiple times, solved each time after reading a dodgy internet explanation, then partially forgotten about and retackled half a year later. It is time ...
- 6,896
-1
votes
2
answers
195
views
Heating effect of electric current
I know that
$$H=I² rt$$
I also know it's mathematical derivation , but I can't understand that how the heat is proportional to current squared what must be the logic behind it. I can prove it ...
- 395
6
votes
4
answers
6k
views
How can there be a current and an electric field in an idealized wire with no voltage drop?
In an ideal circuit, How can there be a current b/w points a & b, when there is no potential difference and thus no electric field between a & b? If there is no current, then where does ...
- 1,578
2
votes
2
answers
2k
views
Is there no electric field inside a conductor?
I came across this statement while studying electric currents and I am confused:
"There is no electric field inside a conductor. Hence no current can flow through it".
Is there a fallacy in this ...
- 447
1
vote
1
answer
11k
views
Current against the inverse of resistance graph, $I = V/R +c$
If I have a plot of current ($y$ axis) against 1/Resistance ($x$ axis).
The circuit it is measured from is a simply 2 resistors connected in parallel to battery, where the potential across the ...
- 6,927
14
votes
4
answers
26k
views
How can one derive Ohm's Law? [duplicate]
I am looking for the derivation of Ohm's Law, i.e., $V$ is directly proportional to $I$. Can someone help me with it?
- 559
3
votes
2
answers
8k
views
Why does all the current flow through a short circuit if its voltage drop is considered zero?
Path of least resistance vs. short circuit
I know the path of least reisistance has been clarified already However, to derive the equations you need to assume that the voltage of each parallel ...
anon
2
votes
2
answers
456
views
Ambiguity on the notion of potential in electrical circuits?
As everybody else I have been taught elementary electrical circuits from secondary school to engineering level in analog electronics at university. Invariably, the notion of potential used to ...
- 7,262
8
votes
4
answers
51k
views
Is it possible to flow current in open circuit?
As I know a battery is an example of a closed circuit where it can then produce electricity , electrons will flow from negative pole to positive. A chemistry representation of this battery is for ...
- 295