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Electrostatic Potential And Capacitance

Question

If voltage across a bulb rated 220 V -100W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

20%

2.5%

5%

10%

Solution

Power P= V²/R
For small variation
ΔP/P x 100%
$fraction numerator 2 space straight x space ΔV over denominator straight V end fraction space x space 100 percent sign space equals space 2 space x space 2.5 space equals space 5 percent sign$
Therefore, power would decrease by 5%

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Electrostatic Potential And Capacitance

If voltage across a bulb rated 220 V -100W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

20%

2.5%

5%

10%

Some More Questions From Electrostatic Potential and Capacitance Chapter

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For Daily Free Study Material Join wiredfaculty

Electrostatic Potential And Capacitance

If voltage across a bulb rated 220 V -100W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is 20% 2.5% 5% 10%

Some More Questions From Electrostatic Potential and Capacitance Chapter

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

If voltage across a bulb rated 220 V -100W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

20%

2.5%

5%

10%