A 10-gauge copper wire can safely handle currents up to 30.0 A. You may assume the resistivity of copper is 1.7x10 ⁻⁸ Ω-m.
Instead of expressing wire thickness in terms of a diameter measurement, gauge number is used; the higher the gauge number, the smaller the diameter of the wire. You can read all about gauge number here.
1)What is the resistance of 50 m of 10 gauge copper wire?
2)What is the electric field in the wire when the current is 30 A?
3)How long does it take for an electron to travel 50 m in the wire when the current is 30 A?