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NEET 2004 (AIPMT) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 2004 (AIPMT)

Q79NEET 2004 · AIPMTMedium

Electrical Power & Heating Effect

A battery is charged at a potential of 15 V for 8 h when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 h. The mean terminal voltage during discharge is 14 V. The "watt-hour" efficiency of the battery is

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Answer: (d)

  1. Energy input: 15×10×8=1200 Wh15 \times 10 \times 8 = 1200\text{ Wh}.
  2. Energy output: 14×5×15=1050 Wh14 \times 5 \times 15 = 1050\text{ Wh}.
  3. η=10501200×100=87.5%\eta = \dfrac{1050}{1200} \times 100 = 87.5\%.
  4. So the answer is (d) 87.5%87.5\%.
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