Question

A choke is preferred to a resistance for limiting current in AC circuit because

• A. choke is cheap
• B. there is no wastage of power
• C. choke is compact in size
• D. choke is a good absorber of heat

Answer 1

Answer: (B)

there is no wastage of power

Answer 2

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 $\cos \,o|=\frac{R}{\sqrt{{{R}^{2}}+{{\omega }^{2}}{{L}^{2}}}}$ $\approx \,\frac{R}{\omega L}$ $ (as,R<