Question

A choke coil is preferred to a rheostat in AC circuit as :

• A. it consumes almost zero power
• B. it increases current
• C. it increase power
• D. it increases voltage.

Answer 1

Answer: (A)

it consumes almost zero power

Answer is (A).

A choke coil preferred over rheostat because choke is an inductive device it works in a way similar to A.C that changes the voltage but maintains the same power. But in case of rheostat, it is resistive device thus it controls electric power by dissipating the excess as heat.

So you have to pay for that excess electricity that is the reason behind why we prefer choke over rheostat.