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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
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
- A boy whirls a stone in a horizontal circle of radius 1.5 m and at height 2.0 m
- A spherical drop of capacitance 1μF is broken into eight drops of equal radius.
- Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial.
- The magnetic susceptibility of a material of a rod is 299. Permeability of vacuum
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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