A transformer is used to reduce the mains supply of 220V to 22V. If the currents in the primary and secondary are 2A and 15A respectively, then the efficiency of the transformer is________
A. 65%
B. 75%
C. 80%
D. 90%
Answer:B
A transformer is used to reduce the mains supply of 220V to 22V. If the currents in the primary and secondary are 2A and 15A respectively, then the efficiency of the transformer is________
A. 65% B. 75% C. 80% D. 90%