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Mixed Combination of Cells

A constant vo...

Question

A constant voltage power source is connected to a resistor in an electric circuit .The resistance is increased by four times. Identify the changes in voltage of power source .

A

Increases by two

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B

Increases by four

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C

Decreases by two

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D

Decreases by four

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E

Remains the same

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Solution

The correct option is E Remains the same
As the power source has constant power so it will not change when the resistance is increased. The power dissipated through resistor will be decreased by factor 4 because $P = V^{2} / R$ .

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