Alternating Current (AC) — Transformer Glossary

An electric current that periodically reverses direction, as opposed to direct current (DC) which flows in only one direction.

Backelectrical

Alternating Current (AC)

An electric current that periodically reverses direction, as opposed to direct current (DC) which flows in only one direction.

Transformers operate exclusively on AC because they rely on changing magnetic flux to induce voltage in the secondary winding. The standard frequencies are 50 Hz (IEC regions: Europe, Middle East, Africa, Asia) and 60 Hz (IEEE regions: North America, parts of South America). A transformer designed for 50 Hz can operate at 60 Hz (with reduced flux density) but not vice versa — operating a 60 Hz transformer at 50 Hz causes core saturation and overheating. Dual-frequency (50/60 Hz) designs are available for equipment exported to multiple markets.

Ready to Specify

Get a Quote Tailored to This Specification

Send us your application context — we'll come back with a sized solution, certified to IEC, IEEE/ANSI or UL, and a delivery slot from our Dubai factory.

Talk to Engineering

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.

Core SaturationThe condition where the core's magnetic flux density reaches a level where further increases in magnetizing current produce diminishing increases in flux.