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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 proton is moving in a uniform magnetic field B in a circular path of radius a
- A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10⁻⁵ Wb.
- A proton beam enters a magnetic field of 10⁻⁴ Wb/m² normally. If the specific charge
- The inductive reactance of an inductor of 1/π henry at 50 Hz frequency is
- A particle of mass m oscillates along x-axis according to equation x = a sin ?t
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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