What is the primary function of a switch in electrical circuits?

The primary function of a switch in electrical circuits is to control the flow of electrical current by opening or closing the circuit. When a switch is in the closed position, it allows electricity to flow, completing the circuit and enabling devices to operate. Conversely, when the switch is open, it interrupts the flow of current, effectively turning off the circuit and preventing the devices from receiving power.

Understanding the role of a switch is fundamental in electrical systems. By acting as a simple on-off device, switches provide users with the ability to easily control electrical devices, enhancing both functionality and safety. This foundational concept underpins how most electrical circuits are designed and operated, allowing for the safe management of electrical energy in various applications.