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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
- If the force exerted by an electric dipole on a charge q at a distance of 1 m is F
- A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5).
- The magnetic lines of force inside a bar magnet
- If threshold wevelength for sodium is 6800 Å, the work function will be
- If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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