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Consider the following statements:  A. Choke coil is a high inductance coil.  B. Loss of energy in a choke coil is almost negligible.  Which of the following statement is/are CORRECT?

Consider the following statements:  A. Choke coil is a high inductance coil.  B. Loss of energy in a choke coil is almost negligible.  Which of the following statement is/are CORRECT? Correct Answer A, B both are true

CONCEPT:

Choke coil:

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  • A choke coil is a device that is used in the electrical circuits to allow DC current to flow through it while blocks AC current from passing.
    • A choke consists of a coil of insulated wire that is wound around a magnetic core.
    • The low electrical resistance allows DC and AC to pass with little power loss but it limits the AC current from passing through it due to its reactance.
    • The choke coil works because it can act as an inductor.
    • When the current passes through will change as AC currents create a magnetic field in the coil that works against the AC current. This is known as inductance and blocks most of the AC current from passing through.
    • This results in the currents that do not change such as DC currents can continue passing through while those currents are blocked by the magnetic field.

​EXPLANATION:

  • A choke coil is an inductor coil that is used to block high-frequency AC current and allows the DC current to flow through it.
  • To achieve this, the choke coil must have:
    1. High inductance, so that it can block the AC current.
    2. Low resistance, so that the DC current can easily flow.
  • We know that the loss in energy in the circuit is given as,

⇒ H = I2R

⇒ H ∝ R     -----(1)

  • By equation 1 it is clear that the loss of energy is directly proportional to the resistance. So the loss in energy will be less if the resistance is small.
  • Hence, option 1 is correct.

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