Q. This optocoupler device basically works like a __, connecting two isolated circuits on your PCB

A
Transistor
B
LED
C
Switch
D
None of these
Solution:

A current is first applied to the Optocoupler, which makes the infrared LED emit a light that’s proportional to the current. … This device basically works like a switch, connecting two isolated circuits on your PCB. When current stops flowing through the LED, the photosensitive device also stops conducting and turns off.

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