An optoisolator is built using which two key components?

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Multiple Choice

An optoisolator is built using which two key components?

An optoisolator uses light to pass a signal from one side to the other while keeping the two sides electrically separate. The input side has an LED that converts the electrical signal into light, and the output side has a photodetector that converts that light back into an electrical signal. The two sides are separated by a light-tight barrier, providing galvanic isolation to protect circuits from voltage spikes or ground differences. That’s why the statement about using light to transfer signals between input and output is the best fit. The other ideas involve magnetic coupling (like a transformer), acoustic coupling, or a direct electrical connection—none of which achieve optical isolation the way an optoisolator does.

An optoisolator uses light to pass a signal from one side to the other while keeping the two sides electrically separate. The input side has an LED that converts the electrical signal into light, and the output side has a photodetector that converts that light back into an electrical signal. The two sides are separated by a light-tight barrier, providing galvanic isolation to protect circuits from voltage spikes or ground differences.

That’s why the statement about using light to transfer signals between input and output is the best fit. The other ideas involve magnetic coupling (like a transformer), acoustic coupling, or a direct electrical connection—none of which achieve optical isolation the way an optoisolator does.

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