Question

How much work is done in moving a charge of 3 coulomb from a point at 120v to a point,at 200v?

Answer 1

here is your answer..

$w = to \: find \: \\ q = 3c \\ v = 200 - 120 =8 0 \: v \\ v = \frac{w}{q} \\ w = vq \\ w = 80 \times 3 \\ w = 240 \: joules$

thanks..

hope it helps you

Answer 2

we knew that

voltage = work done/charge

work done = ∆voltage*charge

=( 200-120)* 3

=240 joules.