All Questions
8
questions
0
votes
3
answers
169
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Why is Power in an electric circuit equal to $VI$? [closed]
Where did this formula come from? Everyone I asked just told me to substitute values of in ohms law to derive this but no one told why is power equal to voltage * current. Part of the reason for this ...
- 9
2
votes
5
answers
611
views
Can we use work equation to derive Ohm's law?
Ohm's law states:
$$\textbf V=\textbf I\cdot\text R$$
where $\textbf V$ is voltage, the electric potential difference from a point to another (Electric potential is the potential energy of a positive ...
- 219
9
votes
10
answers
6k
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Why is Power = Voltage $\times$ Current?
So P = I*V because V is the amount of energy per coulomb and I is the amount of electrons going past a cross sectional area in one second.
So if we do the math, since V = J/C and I = C/sec, if we ...
- 191
1
vote
2
answers
246
views
What happens to electrons when they do work across a component in a circuit?
When a current flows through a component such as a lightbulb, how is work done?
I was thinking it was the speed of the electrons and that after a current goes through a lightbulb the electrons in the ...
0
votes
2
answers
79
views
Can someone please explain the work of a resistor?
Well I want to know what does a resistor do let our electrical appliances from burning in a circuit I know it does not slow the current flow so what does it really do?
- 11
0
votes
1
answer
368
views
Work done in moving a charge in circuit?
Why is the work done in moving a charge from one point to another in a circuit through any path the same even though heat and other losses are there?
- 65
0
votes
3
answers
441
views
Work done on a battery
Consider a battery of EMF $E $ and label its positive terminal $P $ and Negative terminal $N $.
Consider current flowing through the battery from $N $ to $P $. Then work is done by the battery. This ...
- 253
9
votes
4
answers
5k
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Work done by magnetic field on current carrying conductor
Suppose a wire of length L carrying a current I is kept in a uniform magnetic field B perpendicular to the current. The force on the wire will be IBL and work done by magnetic force when wire moves a ...
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