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A choke coil is preferred to a resistanc...

A choke coil is preferred to a resistance for reducing current in an ac circuit because .

A

choke coil is cheap

B

there is no wastage of power

C

choke is compact in size

D

choke is a good absorber of heat

Text Solution

Verified by Experts

The correct Answer is:
B
In an AC circuit , the coil of high inductance and negligible resistance used to control current, is called the choke coil . The power factor of such a coil is given by
cos `phi` = R/`sqrt R^(2) + omega^(2)L^(2) ` `approx` R `omega`L (as R ltlt `omega`L)
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