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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
- A tyre filled with air (27° C and 2 atm) bursts. The temperature of air is (ˠ=1.5)
- An alpha nucleus of energy 1/2 mv² bombards a heavy nuclear target of charge Ze
- A round uniform body of radius R, mass M and moment of inertia I rolls down
- To obtain a p-type semiconductor, germanium must be doped with
- The sun light reaches us as white and not as its components because
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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