A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80 % , the current drawn from the line is

Question

A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80 % , the current drawn from the line is, 3 A, 30 A, 0 . 3 A, 2 . 4 A

MARKS App · Accepted Answer

η % = 80 100 = V s I s V p I p = 120 × 20 1000 × I p I p = 120 × 20 1000 × 0.8 = 3 A

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