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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity1 Mark
MCQ
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:
  • A
    100%
  • B
    200%
  • C
    300%
  • D
    400%
✓

Answer

  1. 300%

Explanation: The heat generated by a resistor is directly proportional to square of current. Hence, when current becomes double, dissipation of heat will multiply by 22 = 4. This means there will be an increase of 300%.

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