Question

(a) For a given a.c., i = imsinωt, show that the average power dissipated in a resistor R over a complete cycle is 1/2i2m R.

(b) A light bulb is rated at 100W for a 220V a.c. supply. Calculate the resistance of the bulb

Answer 1

(a) From graph of i2 – t
Average power consumed in resistor R