A transformer is a passive electrical device that transfer energy between circuits through electromagnetic induction. Current flowing through one coil in the transformer produces a magnetic field, which induces voltage in a second coil.

Induction between coils allows a transformer to increase or decrease voltage, making transformers essential for power transmission, distribution and utilization in AC power applications.

Transformers are most often used to decrease supply voltage for low voltage circuits. They are also used to isolate equipment from mains power, maintain constant voltage, measure voltage potential, and measure current.

Transformers: Learn About Transformers Here > A transformer is an electrical device which, by the principles of electromagnetic induction, transfers electrical energy from one electric circuit to another, without changing the frequency. The energy transfer usually takes place with a change of voltage and current. Transformers either increases or decreases AC voltage.
Transformers are used to meet a wide variety of needs. Some transformers can be several stories high, like the type found at a generating station or small enough to hold in your hand, which might be used with the charging cradle for a video camera. No matter what the shape or size, a transformers purpose remains the same: transforming electrical power from one type to another.
There are many different types of transformers in use today. This resource will take a closer look at Power Transformers, Auto Transformers, Distribution Transformers, Instrument Transformers, Isolation Transformers, Potential Transformers and Current Transformers.