What is the function of a switch in a circuit?

• A. A device that stores electrical energy.
• B. A device that generates current.
• C. A device that allows the path to be broken, disrupting current.
• D. A device that increases the circuit's resistance permanently.

Answer: (C)

A switch controls whether the circuit is complete. When the switch is closed, it provides a continuous path for current from the power source to the load, so current can flow. When the switch is opened, the path is broken and current stops. This is why a switch’s job is to turn the circuit on or off. It doesn’t store energy or generate current, and it doesn’t permanently increase resistance; it simply connects or disconnects the path for current. For example, in a flashlight, turning the switch on completes the circuit so the bulb lights, and turning it off opens the circuit so the light goes out.