Automotive Electronics Complete Practice Test 2025

In wiring, the American Wire Gauge (AWG) system is used to specify the diameter of electrical wires. As the AWG number increases, the physical size of the wire decreases. This means that higher AWG numbers correspond to thinner wires. For example, a 12 AWG wire is thicker than a 20 AWG wire. This principle is critical in automotive and other electrical applications, as the size of the wire can affect its ability to carry electrical current—smaller wires can carry less current compared to larger wires.

Understanding the relationship between AWG and wire size is essential for selecting the appropriate wire for specific applications, ensuring efficient current flow and preventing overheating. In automotive applications, using the correct wire gauge is crucial for safety, performance, and reliability of the electrical systems.