Question

A choke coil is a

• A. High resistance and low inductance coil
• B. Low resistance and high Inductance coil
• C. Low resistance and low inductance coil
• D. High resistance and high inductance coil

Answer 1

The correct option is B Low resistance and high Inductance coil

Since an inductor is a non-resistive device, it does not consume any power in the form of heat like a resistance.
Current in $L-R$ circuit is given by

$I=\frac{v}{\sqrt{R^2+(\omega L{)}^2}}$

Power loss $=I^{2}R=\frac{v^{2}R}{R^2+(\omega L{)}^2}=\frac{v^2}{R+\frac{{\omega }^2{L}^2}{R}}$

For minimum power loss, resistance should be low and inductance should be high.
A choke coil will has got high inductance and low resistance.