उत्सर्जक

Emitter may refer to:

Devices which emit charged particles:
Cathode, or positive electrode, in a vacuum tube or transistor
Anode, or negative electrode, in certain applications based on the emission of ions from a solid surface 

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:
Emitter, a device used in drip irrigation