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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: - Radii of curvature of a converging lens are in the rato 1:2. Its focal length
- A body is rolling down an inclined plane.If KE of rotation is 40% of KE in a translatory
- A potentiometer wire is 100cm long and a constant potential difference is maintained
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Radii of curvature of a converging lens are in the rato 1:2. Its focal length
- A body is rolling down an inclined plane.If KE of rotation is 40% of KE in a translatory
- A potentiometer wire is 100cm long and a constant potential difference is maintained
- Pick out the correct statements from the following
- A cord is wound round the circumference of wheel of radius
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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