A) 30%
B) 50%
C) 90%
D) 10%
Correct Answer: C
Solution :
The efficiency of transformer \[=\frac{\text{Energy obtained from the secondary coil}}{\text{Energy given to the primary coil}}\] or \[\eta =\frac{\text{Output}\,\text{power}}{\text{Input}\,\text{power}}\] or \[\eta =\frac{{{V}_{s}}{{I}_{s}}}{{{V}_{p}}{{I}_{p}}}\] Given, \[{{V}_{s}}{{I}_{s}}=100\,W,\]\[{{V}_{p}}=220\,V,\]\[{{I}_{p}}=0.5A\] Hence, \[\eta =\frac{100}{220\times 0.5}=0.90=90%\]
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