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होम › भौतिकी › Electrical Energy and Power

Electrical Energy and Power — Physics Questions & Practice

701 Electrical Energy and Power questions from Physics for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong. का अभ्यास करें

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Electrical Energy and Power पर अभ्यास प्रश्न — उत्तर सहित

Try each question first, then open the answer. Explanations are included.

1. A current of 8 A flows through a resistor of 50 ohm for 2 seconds. What is the heat generated? (H = I^2Rt, Joule's Law)

  1. A6400
  2. B5954.088
  3. C6402
  4. D4895.85
उत्तर दिखाएँ

उत्तर: A

H = I^2 x R x t = 8^2 x 50 x 2 = 64 x 50 x 2 = 6400 J.

2. An electrical appliance has a power rating of 870 W and is used for 8 hour(s). What is the electrical energy consumed (in watt-hours)?

  1. A6970
  2. B6950
  3. C6960
  4. D6955
उत्तर दिखाएँ

उत्तर: C

Electrical Energy = Power x Time = 870 x 8 = 6960 Wh.

3. A current of 4 A flows through a resistor of 50 ohm for 1 seconds. What is the heat generated? (H = I^2Rt, Joule's Law)

  1. A790
  2. B795
  3. C802
  4. D800
उत्तर दिखाएँ

उत्तर: D

H = I^2 x R x t = 4^2 x 50 x 1 = 16 x 50 x 1 = 800 J.

4. An electrical appliance has a power rating of 1150 W and is used for 3 hour(s). What is the electrical energy consumed (in watt-hours)?

  1. A3460
  2. B3951.523
  3. C3450
  4. D3451
उत्तर दिखाएँ

उत्तर: C

Electrical Energy = Power x Time = 1150 x 3 = 3450 Wh.

5. A current of 3 A flows through a resistor of 20 ohm for 2 seconds. What is the heat generated? (H = I^2Rt, Joule's Law)

  1. A358
  2. B350
  3. C360
  4. D331.658
उत्तर दिखाएँ

उत्तर: C

H = I^2 x R x t = 3^2 x 20 x 2 = 9 x 20 x 2 = 360 J.

Electrical Energy and Power और प्रश्न हल करें

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