A) \[95%\]
B) \[99%\]
C) \[90%\]
D) \[96%\]
Correct Answer: C
Solution :
: The efficiency of the transformer is \[\eta =\frac{Output\,power({{P}_{out}})}{Input\,power\,({{P}_{m}})}\times 100\] Here, \[{{P}_{out}}=100W\] \[{{P}_{m}}=(220V)(0.5A)=110W\] \[\therefore \] \[\eta =\frac{100W}{110W}\times 100\approx 90%\]
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