Inductor Energy Calculator

Inductor Energy

Inductors store energy in the form of a magnetic field when current flows through them. Unlike capacitors, which store energy in electric fields, inductors resist changes in current and release stored energy when the current decreases.

Formula

E = ½ L I²

Where:

• E = stored energy (joules, J)
• L = inductance (henries, H)
• I = current through the inductor (amperes, A)

Worked Example

Suppose an inductor of 4 H carries a current of 3 A.

E = ½ × 4 × (3²) = 18 J

The inductor stores 18 joules of magnetic energy.

Applications

• Power Electronics: Energy storage in SMPS, inverters, and DC-DC converters.
• Filters: Used in LC circuits for tuning and frequency selection.
• Communication Systems: Resonant circuits in radios and transmitters.
• Energy Transfer: Key role in transformers and wireless charging systems.

Insights

Energy in inductors is fundamental in analyzing transient responses in circuits, especially when switching is involved. This concept is vital in both low-power electronics and large-scale electrical systems like motors and power grids.