Physics 1.9: 3.2.1 Current and Resistance

Multiple Choice

Assuming that this diagram of a battery represents part of a continuous circuit, in which directions are the current and flow of electrons?

• The direction can’t be found from this drawing.

• Electrons flow from right to left, and the current flows from left to right.

• Electrons flow from left to right, and the current flows from right to left.

Multiple Choice

Which part of this image represents a conductor?

• The metal prongs of the plug

• The plastic on the outside of the plug and wire

Multiple Choice

Which part of this image represents an insulator?

• The metal prongs of the plug

• The plastic on the outside of the plug and wire

Multiple Choice

Copper has a lower resistivity than tungsten. Which hose is a better model for copper wire?

• Hose A

• Hose B

Multiple Choice

How much voltage is required to run 0.020 A of current through a 45 Ω resistor in a computer circuit? (V = IR)

• 0.00044 V

• 0.90 V

• 2250 V

Multiple Choice

The batteries in a flashlight have a total voltage of 3 V. The current measured between the positive and negative sides of the battery is 1.1 A. What is the resistance in the circuit in the flashlight? (V = IR)

• 0.37 Ω

• 1.9 Ω

• 4.1 Ω

• 3.3 Ω

• 2.7 Ω

Multiple Select

Which two statements about power are true? (P = IV)

• Power decreases as voltage increases.

• Power increases as voltage increases.

• Power does not depend on voltage.

• Power does not depend on current.

• Power increases as current increases.

Multiple Choice

A television plugs into an outlet with a voltage of 120 V and has an electric current of 1.2 A. How much power does the television use? (P = IV)

• 100 W

• 0.01 W

• 140 W