| Assertion: When A.C. contains resistor only, its power is minimum. |
| Reason: Power of a circuit is independent of phase angle. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: D
Solution :
The power of a A.C. circuit is given by \[P={{E}_{V}}{{I}_{V}}\,\cos \theta \]. Where \[\cos \theta \]is power factor and \[\theta \] is phase angle. In case of circuit containing resistance only, phase angle is zero and power factor is equal to one. Therefore power is maximum in case of circuit containing resistor only.
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