4.5 An LED light emitting diode - how does electrical device work? and what is it used for?

An LED emits light when a current flows through it in the forward direction.

Electrical energy is converted into visible light energy, and very efficiently.

Uses of an LED

You should know that there is an increasing use of LEDs for lighting, as they use a much smaller current than other forms of lighting.

They have a much greater efficiency in converting electrical energy into visible light.

LEDs are used in torches and as an indicator that current is flowing through a circuit. e.g. small red, green or blue lights that might indicate your computer power system is functioning.

Know how does an LED (light emitting diode) device works in an electrical circuit.

Know examples of what an LED device is used for e.g.  torches, indicator light of power systems.