In an automotive electrical system, a resistor could be which of the following?

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 resistor is a component that resists current and converts electrical energy into heat (and in some cases light). In automotive circuits, a light bulb fits this role well because the filament provides resistance to the flowing current, heating up as it carries current and emitting light. The resistance of a filament also changes with temperature, which is typical behavior of a resistive element.

A fuse is designed to protect the circuit by blowing open when current is too high, not to act as a load. A relay is essentially a switch activated by a coil, so its primary function isn’t to provide resistance in the load path. A starter is a motor that uses electrical energy to produce mechanical motion, not to serve as a resistive load.

So, the light bulb is the device that could function as a resistor in an automotive electrical system.