What type of switch is a single-pole single-throw switch?

A single-pole single-throw switch is designed to connect or disconnect a single circuit. This type of switch has two terminals: one connected to the power source and the other connected to the load. When the switch is in the "on" position, the circuit is complete, allowing current to flow, and when in the "off" position, the circuit is broken, stopping the current flow. This simple functionality aligns perfectly with the description of connecting one circuit, making it a straightforward choice.

The other options describe different switch functions that do not apply to a single-pole single-throw switch. For example, connecting two circuits or multiple loads requires a different switch configuration, such as a double-pole switch or a multi-pole switch. A variable switch, like a dimmer, adjusts levels rather than simply connecting or disconnecting a circuit, which again does not apply here.