What is the primary function of a circuit breaker?

• A. To store electrical energy
• B. To control and regulate voltage
• C. To prevent electrical overload and short circuits
• D. To increase the power supply

Answer: (C)

The primary function of a circuit breaker is to prevent electrical overload and short circuits. Circuit breakers are safety devices designed to automatically interrupt the flow of electricity when they detect a fault condition, such as an overload (when too much current flows through the circuit) or a short circuit (when current flows along an unintended path). This interruption protects the electrical system from damage and reduces the risk of fire or electrical shock.

When an overload occurs, the circuit breaker trips, cutting off the electrical supply to the affected circuit, which helps prevent overheating and potential hazards. Similarly, in the case of a short circuit, the rapid increase in current triggers the breaker to trip almost instantly, preventing extensive damage to wiring and equipment connected to that circuit.

The other options do not accurately reflect the primary purpose of a circuit breaker. Storing electrical energy is related to devices like batteries and capacitors. Controlling and regulating voltage is a function typically attributed to voltage regulators or transformers. Increasing the power supply involves devices like transformers or generators, which alter voltage levels rather than interrupting current flow.