Question

37. a light bulb is rated 200 w for 220 v ac supply of 50 hz. Calculate (i) the resistance of the bulb; (is) the rms current through the bulb

Answer 1

Power = 200 W

Voltage = 220 V

Power = Voltage * current

200 = 220 * current

current = 0.91 A

Resistance = Voltage / Current

Resistance = 220 / 0.91

Resistance = 242 Ohm