What is the purpose of a relay?
A. To amplify electrical signals
B. To switch electrical circuits on and off
C. To filter electrical noise
D. To measure electrical resistance
Answer:B
What is the purpose of a relay?
A. To amplify electrical signals B. To switch electrical circuits on and off C. To filter electrical noise D. To measure electrical resistance
Explanation: A relay is an electrically operated switch that uses an electromagnet to activate or deactivate a switch or circuit. It is used to control a high-power circuit with a low-power signal, such as turning on a large electric motor with a small push-button switch.