What is the purpose of an electrical fuse?

The purpose of an electrical fuse is to protect a circuit from excessive current. Fuses are designed to break the circuit when the current flowing through them exceeds a predetermined level. When an excessive current occurs, typically due to a fault or overload, the fuse element melts, creating an open circuit that prevents further current flow. This protective mechanism helps to prevent overheating, potential fires, damage to electrical components, and ensures safety in electrical systems.

In contrast, enhancing the flow of electricity or increasing the voltage in a circuit does not align with the function of a fuse. Similarly, converting AC to DC is a task for specific components like rectifiers, not fuses. Therefore, the primary role of a fuse is indeed to monitor and safeguard against dangerous current levels, making option B the correct response.