Physics Dept. Demonstration Manual

DEM50 - Transformer Effect Demonstration


To illustrate that the primary and the secondary windings do not require electrical connection to operate.

  • a unit with a transformer circuit
  • 40 W lamps, 2


A lamp is connected in series with an inductor, which represents the primary windings. A matching inductor is connected and attached to a second lamp. This inductor represents the secondary windings. When two inductors are put together, the lamp in the secondary will light illustrating mutual induction by completion of the electromagnetic circuit between primary and secondary windings of the transformer.