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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 body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three
- A particle moves in a circle of radius 5 cm with constant speed and time period
- If R is the radius of earth, the height at which the weight of a body 1/4 of its weight
- Dimensional formula for electrical resistance R is given by
- The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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