An opto-isolator is an electronic component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 25 kV/μs.
Optocoupler on a circuit board. Note the pair of class Y1 safety capacitors.
A reflective pair (left) and two slotted couplers with the light paths in purple
An electronic component is any basic discrete electronic device or physical entity part of an electronic system used to affect electrons or their associated fields. Electronic components are mostly industrial products, available in a singular form and are not to be confused with electrical elements, which are conceptual abstractions representing idealized electronic components and elements. A datasheet for an electronic component is a technical document that provides detailed information about the component's specifications, characteristics, and performance.
Various electronic components, with a 15 cm ruler to scale.
Various examples of Light-emitting diodes
SMD resistors on the backside of a PCB
Some different capacitors for electronic equipment