Question

A 500 W, 220 V bulb is supplied with
) 110 V. Power consumption by the bulb
will be
(a) slightly less than 125 W
(6) slightly greater than 125 W
(c) exactly 125 W
(d) 250 W

Answer 1

Answer:

exactly 125 W

Explanation:

A 500 W, 220 V bulb is supplied with  110 V

Power consumption = V²/R

=> 220²/R  = 500

When V = 110V

then Power consumption

= 110²/R

= (220/2)²/R

= 220²/4R

= 500/4

= 125W

Power consumption by the bulb will be  exactly 125 W