Question

AN electric bulb is marked with 220V and 100W what does it indicate? A) IF A bulb work on 110 V what is the power then ? B) what is the resistance??​

Answer 1

Answer:

Explanation:

Potential Difference = 220V

Power = 100W

Therefore we can say R = V^2/P

R(Resistance) = 220^2/100

R= 484Ω (Ans for B)

A) For Potential Difference = 110V

P = V^2/R

P = 110^2/484

P = 25W