Inductance — Transformer Glossary

The property of a conductor by which a change in current induces an electromotive force (EMF) in the conductor itself or in a nearby conductor.

Backelectrical

Inductance

The property of a conductor by which a change in current induces an electromotive force (EMF) in the conductor itself or in a nearby conductor.

Inductance is the fundamental principle behind transformer operation. Self-inductance generates back-EMF in the primary winding, while mutual inductance transfers energy to the secondary winding. The coupling coefficient (ideally 1.0) determines transfer efficiency. Measured in henries (H), the inductance depends on: number of turns², core permeability, core cross-section area, and magnetic path length.

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ReactanceThe opposition to alternating current caused by inductance or capacitance in a circuit, measured in ohms.

Primary WindingThe winding connected to the power source (input side) of a transformer. It receives electrical energy and creates a magnetic field in the core.