Which device is commonly used to protect circuits from overloads?

A circuit breaker is commonly used to protect electrical circuits from overloads. This device automatically interrupts the flow of electricity when it detects excessive current, which can occur due to faults such as overloading or short circuits. By tripping and cutting off power, a circuit breaker helps prevent potential damage to the electrical system, reduces the risk of fire, and ensures safety by avoiding overheating of wires and components.

In contrast, a voltage meter measures electrical potential difference and does not provide any protective function. A resistor is used to limit current or divide voltages in a circuit but does not actively protect against overload conditions. A multimeter is a versatile measuring tool used for various electrical measurements, including voltage, current, and resistance, but it also does not offer protection to circuits. The protective role of a circuit breaker is essential for maintaining the integrity and safety of electrical installations.