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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
- Colours appear on a thin soap film and soap bubbles due to the phenomenon of
- A body with mass 5 kg is acted upon a force F=(-3i+4j) N.If its initial velocity at
- A ball moving with velocity 2 m/s collides head on with another stationary ball
- If a mass of 20g having charge 3.0 mC moving with velocity 20ms⁻¹ enters a region
- The electirc field in a certain region is acting radially outward and is given by E=Ar.
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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