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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%
Related Questions: - Which one of the following bonds produces a solid that reflects light in the visible region
- The number of significant figures in 0.06900
- A thermocouple is made from two metals, antimony and bismuth. If one junction
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which one of the following bonds produces a solid that reflects light in the visible region
- The number of significant figures in 0.06900
- A thermocouple is made from two metals, antimony and bismuth. If one junction
- Photon of frequency ν has a momentum associated with it. If c is the velocity
- At what angle should the two forces 2P and √2 P act,so that the resultant force is P√10?
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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