A) 95%
B) 99%
C) 90%
D) 96%
Correct Answer: C
Solution :
(c) 90% The efficiency of the transformer is \[\eta =\frac{\text{Output}\,\,\text{power}\,\,\left( {{P}_{out}} \right)}{\text{Input}\,\,\text{power}\,\,\left( {{P}_{in}} \right)}\times 100\] Here, \[{{P}_{out}}=100\,\,W,\,\,{{P}_{in}}=(220\,V)\,\,(0.5\,A)=110\,W\] \[\therefore \eta =\frac{100\,W}{110\,W}\times 100\approx 90%\]You need to login to perform this action.
You will be redirected in
3 sec