Lesson 8.1 Review

The current through a 10-ohm resistor is 1.2 amperes. What is the potential difference across the resistor?

• 8.3 V

• 12 V

• 14 V

• 120 V

During a thunderstorm, a lightning strike transfers 12 coulombs of charge in 2.0*10^-3 seconds. What is the average current produced in this strike? 

• 1.7*10^-4 A

• 2.4*10^-2 A

• 6.0*10^3 A

• 9.6*10^3 A

In a simple circuit, a 110-volt electric heater draws 2.0 amperes of current. What is the resistance of the heater?

• 0.018 Ω

• 28 Ω

• 55 Ω

• 220 Ω

The slope of the line on the graph represents

• resistance of a material

• electric field intensity

• power dissipated in a resistor

• electrical energy

What is the resistance of a 20.0-meter-long tungsten rod with a cross-sectional area of 1.00*10^-4 meters squared at 20 degrees Celsius?

• 2.80*10^-5 Ω

• 1.12*10^-2 Ω

• 89.3 Ω

• 112 Ω

If the diameter of a wire were to increase, its electrical resistance would

• decrease

• increase

• remain the same

Which graph below bests represents the relationship between the resistance of a copper wire of uniform cross-sectional area and the wire's length at constant temperature?

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How much current flows through a 12-ohm flashlight bulb operating at 3.0 volts?

• 0.25 A

• 0.75 A

• 3.0 A

• 4.0 A

Which if the following units is NOT one of the units used for work?

• joules

• electronvolt

• ampere

• watt-second

The amount of work required to move charge across a potential difference of 32 volts was 96 electronvolts. What is the value of the charge?

• 0.333 e

• 3 e

• 4.8*10^-19 e

• 3072 e