An opto-isolated relay uses _____ to control the relay?

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Prepare for the NCCER Electrical Level 2 Control Systems and Fundamental Concepts exam. Utilize flashcards and multiple choice questions with hints and explanations. Ensure success on your exam!

Multiple Choice

An opto-isolated relay uses _____ to control the relay?

Explanation:
The signal is transferred optically. An opto-isolated relay uses a light-emitting diode on the input side; when the control signal energizes the LED, it emits light that crosses a nonconductive barrier to a photosensitive device on the output side, which then drives the relay coil. This light-based coupling provides electrical isolation between the control circuitry and the load while still enabling the signal to switch the relay. The other methods—magnetic field, hydraulic signal, or mechanical action—do not provide this optical isolation mechanism, so they’re not how an opto-isolated relay is controlled.

The signal is transferred optically. An opto-isolated relay uses a light-emitting diode on the input side; when the control signal energizes the LED, it emits light that crosses a nonconductive barrier to a photosensitive device on the output side, which then drives the relay coil. This light-based coupling provides electrical isolation between the control circuitry and the load while still enabling the signal to switch the relay. The other methods—magnetic field, hydraulic signal, or mechanical action—do not provide this optical isolation mechanism, so they’re not how an opto-isolated relay is controlled.

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