20. A current of 3.3 A is going through a copper wire (n=8.4x1028 m³) with a diameter of 4.5 mm. What is the electron drift speed in the wire? [1.54x10-$ m/s]

1. The current supplied to an air conditioner unit is 4.5 amps. The air conditioner is wired using a 10- electrons gauge (diameter 2.588 mm) wire. The charge density of the wire is n= 8.48 1028 m³ Find the magnitude of (a) current density and JD m² (b) the drift velocity. S. <飞

A 14-gauge copper wire has a diameter of 1.508 mm. What magnitude current flows in amperes when the drift velocity is 0.500 mm/s? (The density of free electrons in copper is 8.34 x 1028 e /m³.).) A

If a 1.5 V battery stores 5.0 kJ of energy (a reasonable value for an inexpensive C cell), for how many minutes could it sustain a current of 1.2 A?A. 2.7B. 6.9C. 9.0D. 46