Which conductor has the least resistance?

The conductor with the least resistance among those listed is the 1/0 AWG. Resistance in electrical conductors is inversely related to their cross-sectional area; as the gauge number decreases or as the wire size increases, the resistance also decreases.

The AWG (American Wire Gauge) system indicates that 1/0 AWG is larger than #8, #10, and #12 AWG. Specifically, as the gauge number goes down, the actual diameter of the wire increases, allowing more electrical current to pass through with less resistance. Consequently, 1/0 AWG has a larger diameter and lower resistance compared to the other gauges, making it the most efficient choice for conducting electrical current. This principle is critical in applications where minimizing energy loss due to resistance is important, such as in power distribution systems.