Question

An white electric bulb is rated as 220 volt 100 watt. If suppy voltage is 110 v, the light of the bulb will be

Answer 1

Explanation:

R = 220^2/100 Ω = 484 Ω.

This is the resistance of the bulb.

When V = 110 V,

power consumed = V^2/R

= 110^2/484 = 25 W. So, 25

W power is consumed when it is operated on 110 V

Answer 2

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