Which switch allows current to flow only when the button is pressed?

Which switch allows current to flow only when the button is pressed?

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

Answer: (A)

This tests the idea of a momentary normally open switch. A push switch is designed so its contacts are open at rest and close only when you press the button, allowing current to flow only while you’re holding it down. Release the button and the circuit opens again, stopping the current. That direct, press-to-activate behavior is what matches the requirement. Push-to-Break would do the opposite—conducting until pressed, then breaking the circuit. An On-Off switch toggles between conducting and non-conducting states and doesn’t require continuous pressing. A relay involves a coil and separate contacts; pressing a button can energize the coil to change the contact state, but the current flow in the controlled circuit isn’t simply “only when pressed” in the immediate sense.

This tests the idea of a momentary normally open switch. A push switch is designed so its contacts are open at rest and close only when you press the button, allowing current to flow only while you’re holding it down. Release the button and the circuit opens again, stopping the current. That direct, press-to-activate behavior is what matches the requirement.

Push-to-Break would do the opposite—conducting until pressed, then breaking the circuit. An On-Off switch toggles between conducting and non-conducting states and doesn’t require continuous pressing. A relay involves a coil and separate contacts; pressing a button can energize the coil to change the contact state, but the current flow in the controlled circuit isn’t simply “only when pressed” in the immediate sense.