Inductor Energy Calculator
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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.
Frequently Asked Questions
What is stored in an inductor?
Magnetic field energy.
Does an inductor store charge like a capacitor?
No, it stores energy in a magnetic field, not electric charge.
When does an inductor release energy?
When the current through it decreases, the collapsing magnetic field releases energy back to the circuit.
Is the stored energy proportional to current?
Yes, energy increases with the square of current (I²).
Why is inductance important?
Higher inductance means more energy can be stored for the same current.
Where is this used in real life?
In SMPS, inductors store and release energy rapidly to regulate voltage and current.