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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%
Related Questions: - Time period of oscillation of a magnet is 2 sec. When it is remagnetised
- Three particles A,B and C are thrown from the top of a tower with the same speed.
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Time period of oscillation of a magnet is 2 sec. When it is remagnetised
- Three particles A,B and C are thrown from the top of a tower with the same speed.
- A parallel plate air capacitor has capacity C, distance of seperation between plate
- A boy standing at the top of a tower of 20m height drops a stone
- Two cells when connected in series are balanced on 8m on a potentiometer.
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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