Which device is a switch that is operated by an electromagnet rather than by manual pressing?

Which device is a switch that is operated by an electromagnet rather than by manual pressing?

• A. Relay
• B. Push
• C. On-Off Switch
• D. Push-to-Break

Answer: (A)

A relay is an electrically controlled switch. It uses a coil as an electromagnet; when current flows through the coil, a magnetic field pulls an armature and moves the contact, changing the circuit state. This lets a low-power control signal switch a high-power circuit, with electrical isolation between the control and the load. Manual switches like a push button, an on-off toggle, or a push-to-break switch require physical pressing or manual action to operate, rather than being driven by electricity. That’s why the device described is a relay.

A relay is an electrically controlled switch. It uses a coil as an electromagnet; when current flows through the coil, a magnetic field pulls an armature and moves the contact, changing the circuit state. This lets a low-power control signal switch a high-power circuit, with electrical isolation between the control and the load.

Manual switches like a push button, an on-off toggle, or a push-to-break switch require physical pressing or manual action to operate, rather than being driven by electricity. That’s why the device described is a relay.