What action does a Single Pole Single Throw (SPST) switch perform?

The action performed by a Single Pole Single Throw (SPST) switch is to connect or disconnect two terminals. This type of switch consists of a single input and a single output, allowing for a straightforward on-off control mechanism. When the switch is in the "on" position, it completes the circuit, allowing electrical current to flow between the two terminals. Conversely, when the switch is in the "off" position, it breaks the circuit, stopping the flow of current.

This functionality is fundamental in various applications, ranging from simple light switches in homes to basic control systems in electronics. The simplicity of the SPST switch makes it an essential component for reliable and effective electrical control without introducing extra complexity, such as routing or manipulating voltage, which would be features of more complex switch types.