(a) State the relation between potential difference , work done and charge moved.
(b) Calculate the work done in moving a charge of 4 coulomb from a point at $$220$$ volts to another point at $$230$$ volts.
(a) Potential difference = Work done / Charge moved.
(b) $$V1 = 220 \,V , V2 = 230 \,V , $$ Charge moved $$= 4 C$$
Thus , the potential difference $$= V2 - V1 = 230 - 220 = 10.$$
We know that ,
Work done = Potential difference $$\times$$ Charge moved $$= 10 \times 4$$
Work done $$= 40 \,joules.$$