| Assertion: Chock coil is preferred over a resistor to adjust current in an ac circuit. |
| Reason: Power factor for inductance is zero. |
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
Correct Answer: A
Solution :
If resistor is used in controlling AC supply electrical energy will be wasted in the form of heat energy across the resistance wire. However, AC supply can be controlled with choke without any wastage of energy. This is because, power factor\[(cos\,o|)\] is unity for resistance and is zero for an inductance. Use \[[P=EI\,cos\,o|]\]
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