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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 magnetic needle suspended parallel to a magnetic field requires √3J of work
- The resistance of a carbon resistor of colour code Red-Red Green Silver is(in kΩ)
- The power supplied by a force acting on a particle moving in a straight line
- The displacement of a particle varies according to the relation x=4 (cos π t + sin π t)
- A wooden stick 2 m long is floating on the surface of water. The surface tension
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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