Question

A charge of `4 C` is passing through points A and B on a circuit. If the charge's electric potential changes from `45 J` to `13 J`, what is the voltage between points A and B?

Answer 1

The voltage between the points `A` and `B` is `=8V`

Explanation:

The charge is `Q=It`

We apply Ohm's Law

`U=RI`

The power is

`P=UI`

And the energy is

`E=UIt`

`E=UQ`

and

`DeltaE=QDeltaU`

The voltage is

`DeltaU=(DeltaE)/Q=(45-13)/4=32/4=8V`