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Currents

1. When electrons move through a metal conductor,
a. they move in a straight line through the conductor.
b. they move in zigzag patterns because of repeated collisions with the vibrating metal atoms.
c. the temperature of the conductor decreases.
d. they move at the speed of light in a vacuum.

2. A wire carries a steady current of 0.1 A over a period of 20 s. What total charge moves through the wire in this time interval?
A. 200 C
b. 20 C
c. 2 C
d. 0.005 C

3. If a 5.00 x 10^2 W heater has a current of 4.00 A, what is the potential difference across the ends of the heating element.
a. 2.00 x 10^3 V
b. 125 V
c. 2.50 x 10^2 V
d. 8.00 x 10^-3 V

4. In a conductor that carries a current, the drift speed of an electron is
a. less than the average speed of the electron between collisions.
b. equal to the average speed of the electron between collisions.
c. greater than the average speed of the electron between collisions.
d. approximately equal to the speed of light.

Please show the work done, formulas used and the answer. Thank you!

Solution Preview

1.) When electrons move through a metal conductor,
Answer: b. they move in zigzag patterns because of repeated collisions with the vibrating metal ...

Solution Summary

This solution provides brief solutions for each problem, including calculating charge, voltage and speed.

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