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A 220 volt and 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will be
Options
(a) 1000 W
(b) 750 W
(c) 500 W
(d) 250 W
Correct Answer:
250 W
Explanation:
P = V² / R. A bulb has a fixed resistance.
⇒ P₁ / P₂ = V₁² / V₂²
⇒ 10000 / P₂ = (220/110)² = 4
⇒ 4P₂ = 1000 ⇒ P₂ = 250 W
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The relationship between decay constant λ and half-life T of a radioactive substance is
- In the reaction ₁²H+₁³H+₂⁴He+₀¹n, if the binding energies of ₁²H,₁³H and ₂⁴He
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- An electron of a stationary hydrogen atom passes from the fifth energy level to
- The half life of radium is about 1600 year. Of 100 gram of radium existing now
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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