Question

A charge of `6 C` is passing through points A and B on a circuit. If the charge's electric potential changes from `36 J` to `9 J`, what is the voltage between points A and B?

Answer 1

`V_"AB"=-4,5V`

Explanation:

`E_2=9J`
`E_1=36J`
`q=6C`

`Delta E_p=E_2-E_1`
`Delta E_p=-27J`

`W=E_p=q(V_"AB")`

`-27=6*V_"AB"`

`V_"AB"=-27/6`

`V_"AB"=-4,5V`