A) 89%
B) 100%
C) 95%
D) 85%
E) 91%
Correct Answer: E
Solution :
Input power \[{{P}_{in}}=V{{i}_{in}}\] \[=220\times 0.5=110W\] Output power\[{{P}_{out}}=100\,W\] Efficiency \[\frac{{{P}_{out}}}{{{P}_{in}}}\,=\frac{100}{110}\] \[=90.9%=91%\]
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