Question

(149. A bulb rated for 100W, 220V is connected to
a 110V mains supply. The power drawn by it
is:
A. 100 W
B. 50 W
C. 25 W
D. Zero​

Answer 1

Answer:

50 W is the answer

Explanation:

For 220volt 100 watt is used

So for 110 volt 100/220×110=50W

Answer 2

Explanation:

Given rating of the bulb;

V = 220V

P = 100W

Thus current can be given by ; P = VI

P = VI

100 = 220×I

I = 10/22 A

When this current flow in the potential difference of 110V so the powe in the circuit will be ;

P = VI

P = 110 × 10/22

P = 1100/22

P = 100/2

P = 50W or 50watts or 0.05kW