JEE Main 2024 Physics 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 the transformer is made of copper. The output current of transformer is A.
Answer: 45
Solution
Input power = 2.3 kV × 5 A = 11.5 kW. With 90% efficiency the output
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