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What kind of device is the Relay Module?

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What kind of device is the Relay Module?

(a) Passive Sensor

(b) Active Sensor

(c) Radio Device

(d) Switching Device

The question was asked in quiz.

Query is from Relay (Dual Channel) Module in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

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The correct choice is (d) Switching Device

Explanation: The Relay Module is a switching device since it’s primary function is to switch or change the direction of flow of current or stop it altogether. This way it controls the working of any given circuit.

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