A transformer of efficiency 90 % has turns ratio 10 : 1 . If the voltage across the primary is 220 V and current in the primary is 0.5 A , then the current in secondary is

Question

A transformer of efficiency 90 % has turns ratio 10 : 1 . If the voltage across the primary is 220 V and current in the primary is 0.5 A , then the current in secondary is, 5.5 A, 5 A, 4 A, 4.5 A

MARKS App · Accepted Answer

Given, N P N S = 10 1 V P = 220 V , I P = 0.5 A We know that, V P V S = N P N S Efficiency, η = O u t p u t p o w e r I n p u t p o w e r = I S V S I P V P 90 100 = I S 0.5 × 1 10 ⇒ I S = 4.5 A

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