A source of potential difference V volt sends current I ampere in a circuit for time t second. Write expressions for

(a) electrical energy supplied by the source, and

(b) electrical power spent by the source.

(a) Potential difference = V volt
Current = I ampere
time = t sec
Electrical energy supplied W = VIt

(b) Power is the rate of doing work.

P = $\dfrac{\text{W}}{\text{t}}$ = $\dfrac{\text{VIt}}{\text{t}}$ = VI

P = VI