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Physics
Physics
Problem
A transformer draws
5
A
5\,\text{A}
5
A
from a
220
V
220\,\text{V}
220
V
mains and supplies
22
A
22\,\text{A}
22
A
at
48
V
48\,\text{V}
48
V
to a load. Neglecting all losses, the efficiency of the transformer is closest to a)
104
%
104\%
104%
b)
86
%
86\%
86%
c)
96
%
96\%
96%
d)
91
%
91\%
91%
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