A bulb of 100 watt rated 220 v is used at 110 v. What watt power is being consumed?
Answers
Answered by
1
P = V²/R
If V = 220 V we have
100 W = 220²/R
R = 220²/100 Ω = 484 Ω. This is the resistance of the bulb.
When V = 110 V, power consumed = V²/R = 110² /484 = 25 W.
Similar questions