| Assertion: Choke coil is preferred over a resistor to adjust in an A.C. circuit. |
| Reason: Power factor for inductance is zero. |
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: A
Solution :
If resistor is used in controlling A.C. supply, electrical energy will be wasted in the form of heat energy across the resistance wire. However, A.C. supply can be controlled with Choke without any wastage of energy. This is because, power factor \[\left( \cos \theta \right)\] for resistance is one and it is zero for an inductance.
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