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A 100% efficient transformer has a turns ratio of 1/5. If the secondary current is 50 milliamperes, the primary current is:
0.25 A
Turns ratio N_pri / N_sec = 1/5. Current ratio is inverse to turns ratio: I_pri / I_sec = N_sec / N_pri = 5/1. I_pri = I_sec * 5 = 50 mA * 5 = 250 mA = 0.25 A.
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