A power transmission line feeds input power at 2 . 3 kV to a step down transformer with its primary winding having 3000 turns . The output power is delivered at 230 V by the transformer. The current in the primary of the transformer is 5 A

Question

A power transmission line feeds input power at 2 . 3 kV to a step down transformer with its primary winding having 3000 turns . The output power is delivered at 230 V by the transformer. The current in the primary of the transformer is 5 A and its efficiency is 90 % . The winding of transformer is made of copper. The output current of transformer is ____ A .

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Correct answer: 0

Given: Input power, P i = 2300 × 5 watt Output power, P 0 = 2300 × 5 × 0 . 9 Now, we can write η = P out P in = V S I S V P I P ⇒ 0 . 9 = 230 I S 2300 × 5 ⇒ I S = 45 A .

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