Question

A choke coil is a
A). Device to reduce current in DC circuit
B). Device to reduce current in AC circuit
C). Coil of large inductance
D). Coil of negligible resistance

Answer 1

Hint: A choke coil is an inductance coil of very small resistance used for controlling current in an AC circuit. In electronics, it is used to block higher frequencies while passing direct current and lower frequencies of alternating current in an electrical circuit.

Complete answer step by step:
As a choke coil works as an inductor, it is used in electrical circuits to allow DC current to flow through the circuit and block AC current from passing through circuits.
Why choke coil, because it wastes power in the form of heat which could happen in an ordinary resistor.

So, from above the given options, three options are correct.
A choke coil is
- Device to reduce current in AC circuit
- Coil of large inductance
- Coil of negligible resistance

Additional information:
Choke coil is used in fluorescent lamps or tubes, initially it provides a very high voltage and once the gas in the tube is ionized, choke provides a low voltage.
Usually it is used to allow DC and blocks AC to pass through the circuit.
Choke coil protects the circuit in case of steep rise in current, the steep rise in current damages the insulation present in the circuit. The choke coil helps by increasing the current gradually rather than steeply increasing.

Note: Remember that choke coil is an inductor or a combination of an inductor. And the word ‘choke’ is for choke out high frequencies and allow lower ones. For an ideal choke coil, no electrical energy is wasted i.e. average power P=0.