In terms of electrical components, what is the purpose of a fuse?

A fuse serves as a critical safety device in electrical systems by protecting the circuit from overload conditions. When too much current flows through the circuit, the fuse melts and breaks the circuit, thereby stopping the flow of electricity. This helps to prevent damage to the electrical components and reduces the risk of fire.

In this role, the fuse essentially acts as a safety device designed to fail under excessive current conditions, thereby safeguarding the rest of the system. Other options do not fulfill this function; for instance, a fuse does not prevent current flow under normal operating conditions, act as a switch to control current flow, or increase voltage, which are roles associated with different electrical components.