New Jersey Esthetics Practice Exam 2026 – Complete Test Prep

Closing a circuit refers to creating a complete path for electricity to flow. When a light switch is turned on, it connects the two terminals, allowing the electrical current to flow through the circuit and power the light. This action effectively closes the circuit, thus enabling the electrical device (in this case, the light) to operate.

In contrast, turning off a light switch opens the circuit, breaking the path of electricity, which prevents the light from illuminating. Similarly, unplugging an appliance or opening a fuse box also disrupts the circuit by interrupting the flow of electricity, neither of which would be examples of closing a circuit. Therefore, the action of turning on a light switch is a clear illustration of how to effectively close a circuit and allow the flow of electricity.