Current Electricity - Result Question 66

71. If voltage across a bulb rated 220 Volt- 100 Watt drops by 2.5 of its rated value, the percentage of the rated value by which the power would decrease is :

[2012]

(a) 20

(b) 2.5

(c) 5

(d) 10

Show Answer

Answer:

Correct Answer: 71. (c)

Solution:

  1. (c) Resistance of bulb is constant

P=V2R⇒Dpp=2DVV+DRR

Dpp=2×2.5+0=5

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