Flow of Electric Current Test Review

Which of the following is not a characteristic of electrical potential energy?

• It is a form of mechanical energy.

• It results from a single charge.

• It results from the interaction between charges.

• It is associated with a charge in an electric field.

When a positive charge moves in the direction of the electric field, what happens to the electrical potential energy associated with the charge?

• It increases.

• It decreases.

• It remains the same.

• It sharply increases, and then decreases.

When you flip a switch to turn on a light, the delay time before the light turns on is determined by...

• the number of electron collisions per second in the wire.

• the drift speed of the electrons in the wire.

• the speed of the electric field moving in the wire.

• the resistance of the wire.

Which of the following does not affect a material’s resistance?

• the length of the material

• the type of material

• the temperature of the material

• Ohm’s law

Which of the following wires would have the least resistance, assuming that all of the wires have the same cross-sectional area?

• an iron wire 10 cm in length

• an iron wire 5 cm in length

• a copper wire 10 cm in length

• a copper wire 5 cm in length

Which of the following wires would have the greatest resistance?

• an aluminum wire 10 cm in length and 3 cm in diameter

• an aluminum wire 5 cm in length and 3 cm in diameter

• an aluminum wire 10 cm in length and 5 cm in diameter

• an aluminum wire 5 cm in length and 5 cm in diameter

Which of the following wires would have the least resistance?

• an aluminum wire 20 cm in diameter at 40°C

• an aluminum wire 20 cm in diameter at 60°C

• an aluminum wire 40 cm in diameter at 40 °C

• an aluminum wire 40 cm in diameter at 60°C

When electrons move through a metal conductor,

• they move in a straight line through the conductor.

• they move in zigzag patterns because of repeated collisions with the vibrating metal atoms.

• the temperature of the conductor decreases.

• they move at the speed of light in a vacuum.

The power ratings on lightbulbs are measures of the

• rate that they give off heat and light.

• voltage they require.

• density of the charge carriers.

• amount of negative charge passing through them.

One ampere of current is the movement of ________ through a given area in one second.

• one coulomb of charge

• one volt of potential difference

• one joule of energy

• one electron