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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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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A particle has initial velocity(3i⃗ +4j⃗)and has acceleration (0.4i⃗ +0.3j⃗)
- The flux linked with a coil at any intant t is given by ?=10t² – 50t + 250
- What will be the ratio of the distance moved by a freely falling body from rest in 4th
- There are four light-weight-rod samples A,B,C,D seperately suspended by threads
- The de-Broglie wavelength of neutron in thermal equilibrium at temperature T is
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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