primary and secondary powers of a transformer are 200W and 100W respectively. The efficiency of transformer is:
a) 50%
b) 1
c) 20%
d) 10%
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Answer:
Correct option is
D
90%
Given,
The mains current is 0.5A.
The mains voltage is 220V.
Power of light =100Wand voltage V=110V
The efficiency is n=
input
output
×100=
220×0.5
100
×100=90.9
The approximate efficiency of transformer is 90%.
Therefore the correct option is D.
Explanation:
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