A transformer with efficiency 80 % works at 4 kW and 100 V . If the secondary voltage is 200 V , then the primary and secondary currents are respectively

Question

A transformer with efficiency 80 % works at 4 kW and 100 V . If the secondary voltage is 200 V , then the primary and secondary currents are respectively, 40 A and 16 A, 16 A and 40 A, 20 A and 90 A, 40 A and 20 A

MARKS App · Accepted Answer

Here, η = 80 % P i = 4 kW = 4000 W V p = 100 V , V s = 200 V I p = P i V p = 4000 100 = 40 A η = V s I s V p I p ; 80 100 = 200 I s 4000 = I s 20 or I s = 20 × 80 100 = 16 A

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