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Question

Power dissipation is maximum in


A

Pure capacitive circuit

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B

Pure inductive circuit

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C

Pure resistive circuit

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D

None of these

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Solution

The correct option is C

Pure resistive circuit


The explanation for the correct option:

Option (C): Pure resistive circuit

1. For an AC circuit, Power dissipated is calculated by the formula

P=VrmsIrmscosϕVrms=RootmeansquareofVoltageIrms=RootmeansquareofCurrentϕ=Phasedifferencebetweencurrentandvoltage

2. In a purely resistive circuit, Current and Voltage are in the same phase therefore phase difference is zero

cosϕ=cos0ocosϕ=1

Therefore power dissipated is maximum

The explanation for incorrect options:

In purely capacitive and inductive circuits, the phase difference is, 90oand cos90o=0 Therefore power dissipated is equal to zero.

Hence the correct option is (C)


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