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JEE Main20205 Sep 2020Morning ShiftPhysicsCurrent ElectricityActual

An electrical power line, having a total resistance of 2 Ω , delivers 1 kW at 220 V . The efficiency of the transmission line is approximately :

Options

  1. A72 %
  2. B91 %
  3. C85 %
  4. D96 %

Correct answer

D. 96 %

Step-by-step solution

i = P V = 1000 220 P R = i 2 R η = 1000 × 100 1000 + 41 . 32 = 96 %

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