The diode

Diodes are electronic components which can be used to regulate the potential difference in circuits and to make logic gates.

Diode

The diode has a very high resistanceresistance: The opposition in an electrical component to the flow of electricity through it. Resistance is measured in ohms. in one direction. This means that current can only flow in the other direction. This is the graph of current against potential difference for a diode:

LEDs

Light emitting diode (LED)

A light-emitting diode, LED, produces light when a current flows through it in the forward direction. LEDs are often used for indicator lights in electrical equipment such as computers and television sets. As LEDs use a much smaller current than other types of lighting, their use is increasing.