Physics > 2002 > 42
WASSCE
A transformer has 400 turns and 200 turns in the primary and secondary winding respectively. if the the current in the primary and secondary winding are 3A and 5A respectively, calculate the efficency of the transformer
A.
85.0%
B.
83.3%
C.
37.5%
D.
30.0%
Answer: B
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