Question

A potential difference of 12 volts causes 2.0 x 10^ 20 electrons to pass a point in a wire in 1 minute calculate

1) the amount of the charge that passes the point in 1 minute ,given that the charge of each electron is 1.6 x10^-19
coulomb

2)electric current in the wire

3)resistance of the wire

Answer 1

Q = N e total charge passing point

Q = 2.0E20 * 1.6E-19 coul = 32 coulombs

2) I = Q / t = 32 C / 60 s = .53 amps

3) R = V / i = 12 volts / .53 amps = 23 ohms