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JEE Main202622 January 2026Evening ShiftPhysicsCurrent ElectricityActual

An electric power line having total resistance of 2 , delivers 1 kW of power at 250 V. The percentage efficiency of transmission line is _ _ _ _ .

Options

  1. A100
  2. B92.5
  3. C96.9
  4. D86.5

Correct answer

C. 96.9

Step-by-step solution

Current in transmission line: I = P V = 1000 250 = 4 A. Power loss: P_ loss = I^2 R = 4^2 2 = 32 W. Efficiency: = P - P_ loss P 100 % = 1000 - 32 1000 100 % = 96.8 % which rounds to 96.9%.

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