What is the purpose of a fuse?

• A. To protect electrical circuits from overload
• B. To increase current capacity
• C. To store energy
• D. To regulate voltage

Answer: (A)

The main idea is that a fuse protects electrical circuits from overload. It does this by using a metal link that carries current under normal use; if the current becomes too high, the link overheats and melts, opening the circuit so the excess current cannot continue to flow. This stops wiring and components from overheating or catching fire. The other options describe functions fuses don’t perform: they don’t increase current capacity, they don’t store energy, and they don’t regulate voltage.