Emitter
# Emitter

Emitter may refer to:

## Devices which emit charged particles

* Cathode, or negative electrode, in a vacuum tube or diode
* Anode, or positive electrode, in certain applications based on the emission of ions from a solid surface
* One of the three terminals of a bipolar transistor

## Devices which emit electromagnetic radiation

* Lambertian emitter, a light source whose radiance varies with angle according to Lambert's cosine law
* An infrared LED used to emulate a remote control

## Other uses

* A device used in drip irrigation
* A compiler's code generator
