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A transformer has an efficiency of 92.5%. the ratio number of turns in the primary coil ...

A transformer has an efficiency of 92.5%. the ratio number of turns in the primary coil to that in the secondary coil is 128 : 45. If the current passing through the secondary coil is 9.0A, calculate the current passing through the primary-coil.

A. 2.93A
B. 3.16A
C. 3.42A
D. 25.60A
E. 27.68A




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