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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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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two wheels having radii in the ratio 1:3 are connected by a common belt
- The total kinetic energy of a body of mass 10 kg and radius 0.5 m moving with a velocity
- Two identical charges repel each other with a force equal to 10 mgwt they are 0.6 m
- An electric kettle has two heating elements. One brings it to boil in ten minutes
- An electric charge 10⁻³ μC is placed at the origin (0,0) of X-Y co-ordinate system.
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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