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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 boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
- Suppose for some reasons, radius of earth were to shrink by 1% of present value,
- Three unequal resistors in parallel are equivalent to a resistance 1 Ω.
- Number of electrons in one mC charge, given e=1.6×10⁻¹⁹ C, will be
- In a parallel plate capacitor with plate area A and charge Q, the force on one plate
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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