The power for a purely resistive circuit is zero when?(a) Current is zero(b) Voltage is zero(c) Both current and voltage are zero(d) Either current or voltage is zeroI have been asked this question during an online interview.I'd like to ask this question from Alternating Current in a Resistive & Inductive Circuit topic in chapter Single Phase Series Circuits of Basic Electrical Engineering

The power for a purely resistive circuit is zero when?(a) Current is z

1.	The power for a purely resistive circuit is zero when?(a) Current is zero(b) Voltage is zero(c) Both current and voltage are zero(d) Either current or voltage is zeroI have been asked this question during an online interview.I'd like to ask this question from Alternating Current in a Resistive & Inductive Circuit topic in chapter Single Phase Series Circuits of Basic Electrical Engineering
Answer» The correct OPTION is (d) EITHER current or voltage is zero To EXPLAIN: P=VIcosϕPower in a circuit is the PRODUCT of voltage, current and the cosine of the phase ANGLE. Phase angle is 00 for purely resistive circuit so, P=VI. Hence if either voltage or current is zero, the power is zero.

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