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JEE Main · 2025 · 03 Apr 2025 · Shift 2 · Current Electricity

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A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is , then the loss of power in units of is
  1. (A)4
  2. (B)8.4
  3. (C)2✓ Correct
  4. (D)6.2

Answer: (C)

Solution

The electrical power supplied to the motor is . With an efficiency of , the useful output is , so the power dissipated as loss is , i.e. . Dividing by , the loss of power is .

JEE Main · 2025 · 03 Apr 2025 · Shift 2 · Single correct option

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