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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
- The voltage of an a.c.supply varies with time (t) as V=120 sin 100 πt the maximum voltage
- A person wants a real image of his own, 3 times enlarged. Where should he stand
- Nuclear fission is not found in
- If the angular momentum of any rotating body increase by 200 % , then the increase
- If the band gap between valence band and conduction band in a material is 5.0 eV,
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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