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A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
Options
(a) 50%
(b) 90%
(c) 10%
(d) 30%
Correct Answer:
90%
Explanation:
? = P output / P input x 100
= 100 / 220 x 0.5 = 90.9%
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A solid sphere, disc and solid cylinder all of the same mass and made up of same material
- A particle is moving in a circle with uniform speed v. In moving from a point to another
- A ball is dropped from the root of a tower of height h
- A 10 micro farad capacitor is charged to 500 V and then its plates are joined
- A thin glass(refractive index 1.5) lens has optical power of -5D in air.
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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