Relays are used for

Relays are used for

• A. signal encoding
• B. remote control of circuits
• C. fuse protection
• D. power generation

Answer: (B)

Relays let a small control signal switch a larger current in a separate circuit, enabling remote control of that circuit. The control side energizes a coil, which creates a magnetic field that moves contacts to close or open the load circuit. This arrangement provides electrical isolation between the control logic (which can be low power and sensitive) and the high-power circuit being switched, while allowing the high-power load to be managed from a distance or from a different part of the system. They can handle various load types (AC or DC) and can be configured with multiple poles to control several lines with a single control signal. Relays aren’t primarily used for signal encoding, fuse protection, or power generation, so those options don’t fit the intended role of a relay.

Relays let a small control signal switch a larger current in a separate circuit, enabling remote control of that circuit. The control side energizes a coil, which creates a magnetic field that moves contacts to close or open the load circuit. This arrangement provides electrical isolation between the control logic (which can be low power and sensitive) and the high-power circuit being switched, while allowing the high-power load to be managed from a distance or from a different part of the system. They can handle various load types (AC or DC) and can be configured with multiple poles to control several lines with a single control signal.

Relays aren’t primarily used for signal encoding, fuse protection, or power generation, so those options don’t fit the intended role of a relay.