All Questions
11
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
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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
1
vote
2
answers
117
views
Working of battery in circuit
The battery has a potential difference. So, shouldn't battery generate an electric field directing from the positive side to the negative side? If that's the case, we know that potential in a wire(...
- 1,179
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
0
votes
3
answers
184
views
Neutral points in an electrical circuit?
I have been told that potential in an electric circuit is defined as the work done in bringing a unit test positive charge to that point inside the circuit. Thus it satisfies the premise that ...
3
votes
4
answers
379
views
Voltage as work in electric field and in Ohm's law
I am struggling to reconcile the definition of voltage as work done moving a unit of electric charge between two points in an electric field and voltage in Ohm's law.
In the work definition, ...
- 155
0
votes
1
answer
243
views
How does the battery do work on the electron although the speed of electrons is constant
In a simple circuit how does the battery do work on the electrons of the wire although their speed is constant .
Imagine I want to take a body which has 5 Newtons weight from the ground to 10 meters ...
- 331
3
votes
2
answers
1k
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How do voltmeters measure work done over a component?
In my physics class, we were shown the picture below to measure the current and potential difference through a component. We were told that the resistance of the ammeter is as low as possible, and the ...
- 145
0
votes
2
answers
291
views
Work done by electric field in a wire
Work done by electric field in moving a unit charge is the potential drop. In wires voltage (potential drop) is given by ohms law. Can somebody explain to me why work done by electric field can not be ...
- 405
3
votes
3
answers
7k
views
What does electric potential mean in a circuit?
As we know that electric potential at a point is defined as a work done by me to carry unit charge from infinity to that point. How can I use this definition in an electric circuit that contains a ...
- 49
1
vote
3
answers
5k
views
Why doesn't potential difference across circuit increase when length of wire increases?
Since $V=Ed$, why doesn't the electric potential increase when length of the wire increases. $d$ increases right? Is it because the battery only pushes the electrons from one terminal to the other and ...
- 295