Incandescent Lamp

A lamp in which light is produced by a filament heated to incandescence by an electric current.

Impulse Test

Tests to confirm that the insulation level is sufficient to withstand overvoltages, such as those caused by lightning strikes and switching.

Impedance

1) The total opposing force to the flow of current in an ac circuit. 2) The combination of resistance and reactance affecting the flow of an alternating current generally expressed in ohms.

IGBT

Insulated Gate Bipolar Transistor