A) 95%
B) 99%
C) 90%
D) 96%.
Correct Answer: C
Solution :
The efficiency of the transformer is \[\eta =\frac{Output\,power\left( {{P}_{ont}} \right)}{Input\,power\,\left( {{P}_{in}} \right)}\times 100\] Here\[{{P}_{out}}=100\,W\], \[{{P}_{in}}=\left( 220\,V \right)\,\left( 0.\,5\,A \right)=110\,W\] \[\therefore \,\,\,\,\eta =\frac{100\,W}{110\,W}\times 100=90%\].
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