Question

A charge of `4 C` is passing through points A and B on a circuit. If the charge's electric potential changes from `17 J` to `1 J`, what is the voltage between points A and B?

Answer 1

`4"V"`

Explanation:

If 1 coulomb of charge is moved through a potential difference of 1 volt then 1 joule of work is done.

`:.` 4C moved through E volts requires 17 - 1 = 16 J.

This means the potential difference must be 4 V.

Or:

`E=W/Q=16/4=4"V"`