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JEE Main 20253 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
3 April
Shift
Evening Shift
Subject
Physics
Chapter
Current Electricity

JEE Main 2025 · 3 April · Evening Shift · Physics · Current Electricity

A motor operating on 100 V draws a current of 1 A. If the...

A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%91.6 \%, then the loss of power in units of cal/s\mathrm{cal} / \mathrm{s} is

Options

  1. A44
  2. B8.48.4
  3. C22
  4. D6.26.2

Correct answer

C. 22

Step-by-step solution

Pinput =Vi=100Wη=Pout Pinput =0.916\begin{aligned} & P_{\text{input }}=V i=100 \mathrm{ W} \\ & \eta=\frac{P_{\text{out }}}{P_{\text{input }}}=0.916\end{aligned}Pout =91.6W Loss =100−91.6=8.4J/s=2cal/s\begin{aligned} & P_{\text{out }}=91.6 \mathrm{ W} \\ & \text{ Loss }=100-91.6=8.4 \mathrm{ J} / \mathrm{s}=2 \mathrm{cal} / \mathrm{s}\end{aligned}$
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