What is the primary function of the fuse box in a vehicle?

The primary function of the fuse box in a vehicle is to protect the wiring and electrical equipment from overloads or short circuits. Fuses are designed to break the circuit when the electrical current exceeds a certain level, which helps prevent wiring damage and potential fires. By disconnecting the power to specific circuits, the fuse box ensures that critical components like lights, sensors, and other electronic devices continue to function without risk of electrical failures.

The other options do not accurately reflect the function of a fuse box. The starter and spark plug are part of the ignition system and do not rely on the fuse box for protection. Additionally, the concept of producing friction for the wheels is related to braking systems and traction, rather than electrical protection. Thus, the focus of the fuse box is exclusively on safeguarding the electrical systems within the vehicle.