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Question

The energy stored (W) in an inductor is given by the formula _______ where C = Capacitance, V= Voltage, I = Current, and L= inductance.

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

\(W= \frac{1}{2}L I^{2}  \)

To determine the formula for the energy stored in an inductor, consider the general equation for energy storage in terms of inductance and current. This is given by:

\(W= \frac{1}{2}L I^{2}\)

Where:

  • W is the energy stored in joules.
  • L is the inductance in henrys (H).
  • I is the current in amperes (A).

The relationship signifies that the energy stored in an inductor is proportional to the square of the current flowing through it, as well as the inductance. This equation is fundamental in electromagnetic theory, particularly when analyzing circuits containing inductors.

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Similar Questions

  1. Which of the given cores of an inductor will have the highest inductance?

  2. Two coils, A and B, have self-inductances of 120 μH and 300 μH, respectively. When acurrent of 1 A flows through coil A, it induces a flux linkage of 100 μWb turns in coil B. What is the mutual inductance between the coils?

  3. What happens to inductive reactance, when frequency increases?
  4. What does inductance (L) oppose in a circuit?
  5. The SI unit of inductance is________.

Important Questions from Inductor and Inductance

  1. The toroid is _______.

  2. Which of the given cores of an inductor will have the highest inductance?

  3. Two coils having inductance of 0.2H and 2.45H are coupled and their mutual inductance is 0.14H. The coefficient of coupling is

  4. An inductor may store charges in its:

  5. Two coils, A and B, have self-inductances of 120 μH and 300 μH, respectively. When acurrent of 1 A flows through coil A, it induces a flux linkage of 100 μWb turns in coil B. What is the mutual inductance between the coils?

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