What is the primary use of a fuse in an electrical circuit?

A fuse plays a critical role in electrical circuits by limiting current flow and providing protection. Its primary function is to prevent excessive current, which can lead to overheating, component damage, or even fire hazards. When the current exceeds a certain threshold, the fuse will melt or break the circuit, interrupting the flow of electricity. This safety mechanism is essential in ensuring that devices operate within safe limits, thereby safeguarding both the equipment and users.

The other options do not serve this protective purpose. Enhancing signal strength relates to amplifiers and signal processing equipment rather than fuses. Increasing voltage levels is managed through transformers and not relevant to the fuse's function. Storing electrical energy is the domain of capacitors and batteries, again unrelated to the role of a fuse. Therefore, the focus on current limitation and circuit protection directly aligns with the fundamental purpose of a fuse, confirming that the correct answer is indeed about limiting current flow and protecting the circuit.