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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
- The average power dissipated in AC circuit is 2 W. If a current flowing through
- A p-n photodiode is made of a material with a band gap of 2.0 eV
- Which phenomenon best supports the theory that matter has a wave nature?
- The velocity of a particle at an instant is 10 ms⁻¹ and after 5 s the velocity
- Which scientist experimentally proved the existence of electromagnetic waves?
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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