Question

A charge of `12 C` is passing through points A and B on a circuit. If the charge's electric potential changes from `36 J` to `12 J`, what is the voltage between points A and B?

Answer 1

`V_AB=-2 "Volt"`

Explanation:

`"Electrical forces doing work if 12C of charge goes"` `"from the point A to B"`
`Delta W=q(V_B-V_A)`
`V_A-V_B=V_(AB)` `"we can write"`
`Delta W=q*V_(AB)`
`Delta W=W_B-W_A`
`Delta W=12-36=-24J`
`"finally:"`
`-24=12*V_AB`
`V_AB=-2 "Volt"`