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When three identical bulbs of 60 W-200 V rating are connected in series to a 200 V supply, the power drawn by them will be
Options
(a) 60 W
(b) 180 W
(c) 10 W
(d) 20 W
Correct Answer:
20 W
Explanation:
In series, Resultant resistance = R₁ + R₂ + R₃ = R + R + R = 3R
Power = V² / R ⇒ 60 = V² / R ⇒ V² = 60 R
Power of combination = P
P = V² / Resistance of combination = 60 / 3 R = 20 W
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the terminal speed of a sphere of gold (density=19.5 kg/m³) is 0.2 m/s
- The manifestation of band structure in solids is due to
- The angle between the two vectors A = 3i+4j+5k and B = 3i+4j-5k will be
- If a solid sphere of mass 1 kg and radius 0.1 m rolls without slipping at a uniform
- A piece of iron is heated in a flame. It first comes dull red then becomes reddish
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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