A) There is no moving part
B) It uses AC only
C) It uses the copper wire for the coils
D) None of the above
Correct Answer: A
Solution :
Option [a] is correct Explanation: Transformer is a static device which transforms power from one circuit to other through electromagnetic induction. In electrical transformer as there are no moving parts, no friction. Losses in the transformer are very less compared to any other rotating machine, hence efficiency of transformers will be very high which is about 95% to 98%.
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