How does a relay work?
A. By using a mechanical switch
B. By using a semiconductor technology
C. By using an electromagnet to activate or deactivate a switch or circuit
D. By using a resistor to change the current
Answer:C
How does a relay work?
A. By using a mechanical switch B. By using a semiconductor technology C. By using an electromagnet to activate or deactivate a switch or circuit D. By using a resistor to change the current
Explanation: A relay works by using an electromagnet to activate or deactivate a switch or circuit. When an electric current is passed through the coil of the relay, it creates a magnetic field that attracts a metal armature, which in turn switches the contacts of the relay. This allows the relay 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. A relay can be used to switch AC or DC circuits on or off, and can also be used to control the operation of multiple circuits at once.