Assertion: led's emitter | /r/HasProperty | light-emitting diode
Facets:
value: usually
type: DEGREE
Source sentences:
text: A photodiode is often combined into a single component with an emitter of light, usually a light-emitting diode (LED), either to detect the presence of a mechanical obstruction to the beam (slotted optical switch) or to couple two digital or analog circuits while maintaining extremely high electrical isolation between them, often for safety (optocoupler).