Recreational Vehicle (RV) Technician Practice Test

Which type of wire gauge has less resistance, 10 gauge or 14 gauge?

1. 14 gauge

2. 10 gauge

3. Both have the same resistance

4. Neither gauge is relevant

The correct answer is: 10 gauge

The 10 gauge wire has less resistance compared to 14 gauge wire due to its larger diameter. Resistance in electrical conductors is inversely related to the cross-sectional area of the wire; as the diameter increases, the resistance decreases. A 10 gauge wire, being thicker, has a greater area for electrons to flow through, which reduces the resistance encountered along its length. This characteristic is crucial in electrical applications, especially in RV wiring, where lower resistance can lead to more efficient power delivery, reduced heat generation, and improved overall performance of electrical components. In contrast, a 14 gauge wire, having a smaller diameter, presents higher resistance to the flow of electricity, which can lead to potential issues such as voltage drops and overheating in applications requiring significant current. Therefore, understanding wire gauge and its impact on resistance is critical for ensuring the reliability and safety of electrical systems in RVs.