Relays are used for?

Relays are used for?

• A. To increase power outputs
• B. To store electrical charge
• C. Remote control of circuits
• D. To measure voltage directly

Answer: (C)

Relays are used to control circuits remotely by acting as a switch that’s driven by a separate, low-power signal. When the control side energizes the relay coil, it activates the switching contacts to open or close the high-power circuit. This lets a small control circuit safely and remotely manage a larger load, while also providing electrical isolation between the control side and the load. This is the best fit because it captures the core purpose of a relay: using a small input to control a larger circuit, enabling remote operation and automation. It isn’t about increasing power, storing charge, or measuring voltage directly—functions better handled by other components like power amplifiers, capacitors, or voltmeters.

Relays are used to control circuits remotely by acting as a switch that’s driven by a separate, low-power signal. When the control side energizes the relay coil, it activates the switching contacts to open or close the high-power circuit. This lets a small control circuit safely and remotely manage a larger load, while also providing electrical isolation between the control side and the load.

This is the best fit because it captures the core purpose of a relay: using a small input to control a larger circuit, enabling remote operation and automation. It isn’t about increasing power, storing charge, or measuring voltage directly—functions better handled by other components like power amplifiers, capacitors, or voltmeters.