In an automotive electrical system, which component could be considered a resistor?

Prepare for the Automotive Service Technician Period 1 exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

A light bulb functions as a resistor in a circuit because it inherently resists the flow of current with its filament. As electricity passes through, the filament heats up and dissipates energy as both heat and light. The resistance of the filament sets how much current flows for a given voltage, and this resistance can change with temperature, making it a practical, variable resistor.

Batteries and alternators are energy sources that supply voltage and current, not primary current-limiting elements. A spark plug is an ignition device that creates a spark across a gap; while it has electrical characteristics, its main purpose is not to resist current.