Question

Calculate the amount of work done to carry out 6c of charge from a point of 100v to 120v

Answer 1

As the potential difference= Work done/Charge .
so the P.D is = 120-100=20V.
and the Charge moved is =6C
Putting the values in the formula:
20=W/6.
20*6=W
so W=120Joule

Answer 2

Potential difference = V = 120 - 100 = 20 v

Charge = Q = 6 C

Work done = W = VQ 
                          = 20 x 6 = 120 Joules