What is the function of a light switch?

A light switch serves the primary function of opening or closing an electrical circuit, which enables or disables the flow of electricity to the light fixture or other connected devices. When the switch is in the "on" position, it completes the circuit, allowing current to flow, thus illuminating the light. Conversely, when the switch is turned "off," it breaks the circuit, stopping the flow of electricity and turning the light off.

This fundamental mechanism of operation is crucial in electrical systems, making light switches a common yet critical component in both residential and commercial applications. Understanding how a light switch operates provides a foundational knowledge of electrical circuits, which is essential for any electrical apprenticeship training.