Technician A says that 10 feet (3 m) of 10 AWG wire has less resistance than 20 feet (6 m) of 10 AWG wire. Technician B says that 10 feet (3 m) of 10 AWG wire has more resistance than 10 feet (3 m) of 20 AWG wire. Who is correct?

Question

Quizplus · Accepted Answer

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Since the cross-sectional area of 10 AWG wire is larger than that of 20 AWG wire, 10 feet of 10 AWG wire will have less resistance than 20 feet of 10 AWG wire.

Technician a Says That 10 Feet (3 M) of 10