Question

A torch bulb of 4.5 V, draws a current of 0.3 A. If the bulb is switched on for 10 minutes, calculate the energy released by the bulb.

Answer 1

P.D. = 4.5 V; current = 0.3 A; t = 10 min = 600 s

Energy released E = I × V × t

= 0.3 × 4.5 × 600

= 810 J