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An electric bulb is rated at 220 V and 100 W . Power consumed by bulb when operated at 110 V will be

Options

  1. A50 W
  2. B75 W
  3. C100 W
  4. D25 W

Correct answer

D. 25 W

Step-by-step solution

P_ rated = V_ rated ^2 R or R= (220)^2 100 Now, power consumed = V^2 R = (110)^2 100 (220)^2 =25 ~W

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