What is the function of a relay in an electrical circuit?

What is the function of a relay in an electrical circuit?

• A. To increase voltage in a circuit
• B. To control a circuit with a low-power signal
• C. To provide backup power supply
• D. To serve as a circuit protection device

Answer: (B)

A relay in an electrical circuit serves the function of controlling a circuit with a low-power signal. It operates as a switch that is activated by an electromagnetic coil. When a low-power signal is applied to the coil, the relay closes or opens the contacts, allowing a higher power circuit to be controlled without direct electrical connection between the two. This allows for greater control over larger loads using smaller signals, facilitating automation, safety, and remote operation in various electrical applications. The design of relays is essential in scenarios where direct manipulation of high-voltage circuits could pose dangers or be impractical. Because of their ability to operate high-power devices safely and effectively through low-power inputs, relays play a critical role in various systems, from household appliances to industrial machinery.

A relay in an electrical circuit serves the function of controlling a circuit with a low-power signal. It operates as a switch that is activated by an electromagnetic coil. When a low-power signal is applied to the coil, the relay closes or opens the contacts, allowing a higher power circuit to be controlled without direct electrical connection between the two. This allows for greater control over larger loads using smaller signals, facilitating automation, safety, and remote operation in various electrical applications.

The design of relays is essential in scenarios where direct manipulation of high-voltage circuits could pose dangers or be impractical. Because of their ability to operate high-power devices safely and effectively through low-power inputs, relays play a critical role in various systems, from household appliances to industrial machinery.