What is the function of a switch in an electrical circuit?

The function of a switch in an electrical circuit is to make, break, or change connections within the circuit. This means that a switch controls the flow of electricity by either allowing or interrupting the electrical current. When the switch is in the "on" position, it completes the circuit, enabling the current to flow. Conversely, when the switch is turned "off," it opens the circuit, resulting in the cessation of current flow. This fundamental property of switches is crucial for providing control over electrical devices, enabling users to turn them on or off as needed.

Understanding this function is essential, as it underpins many practical applications in both everyday electronic devices and larger electrical systems. Switches can be mechanical, like those found in light switches, or electronic, like those used in circuit boards, but their primary role remains the same across different contexts.