A) 3.6 A
B) 2.8 A
C) 2.5 A
D) 5.0 A
Correct Answer: D
Solution :
Given, \[\left( Input voltage \right){{V}_{p}} =220 V\] \[\left( Output voltage \right){{V}_{s}} =440 V\] \[\left( Input current \right){{I}_{p}} = ?\] \[\left( Output current \right) {{l}_{s}} = 2 A\] Efficiency of the transformer, \[\eta = 80\,%\] Efficiency of the transformer is given by \[\eta = \frac{output\,\,power}{input\,\,power}=\frac{{{V}_{s}}{{l}_{s}}}{{{V}_{p}}{{l}_{p}}}\]\[or\,\,\,\,\,{{l}_{p}}=\frac{{{V}_{s}}{{l}_{s}}}{\eta {{V}_{p}}}=\frac{(440)(2)}{\left( \frac{80}{100} \right)(220)}=5\,A\]
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