Exam: 03.08 Electricity Module Exam

In order to create an electromagnet, you would

wrap an insulated wire around a metal with ferromagnetic properties and apply an electric current

A town is considering building a biodiesel power plant that would burn biomass to generate electricity. Which of the following correctly lists an advantage and a disadvantage of this project?

Advantage: it reduces dependence on fossil fuels. Disadvantage: it would emit pollution into the air.

Leah is making a chart to compare and contrast renewable and non-renewable resources. Which of the following would best complete the chart?

Can be replaced at the same rate or faster than they are used

Select the sentence that best describes why copper and some other metals are good conductors.

Copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.

The parents of a young child carefully placed plastic plug protectors in all the electrical outlets in their house. Which statement best describes the role of the plastic protectors?

Electrical outlets contain metal wires that are good conductors of electricity. In order to promote electrical safety, the parents covered the outlets with plastic, an insulator that prevents electrical current from flowing to another object.

Sean and Tommy are debating the positive and negative impacts of technology on environmental quality. Tommy is listing the negative impacts. Which of the following would help his argument?

Factories contribute to air and water pollution.

With pollution on the rise, and demand for fresh water increasing, world leaders are concerned that in the future many people will not have access to clean drinking water. Select the statement that best describes the long-term global effects of this behavior.

Fresh water is a limited resource. If we pollute the fresh water we have, there will be a shortage of clean drinking water in the future.

Which statement is true? Geothermal power plants use the renewable resource of heat from within the Earth to generate electricity. Hydroelectric energy uses the energy from the sun, which is a renewable resource. Oil is a nonrenewable resource that is hardly ever used, so there is not a concern of depleting the Earth's supply. Solar energy is a nonrenewable resource that is used by many countries all over the world.

Geothermal power plants use the renewable resource of heat from within the Earth to generate electricity.

Which statement correctly describes magnetism?

Metals can become magnetic if they have many spinning electrons that create magnetic fields.

Which of the following best describes the use of a nonrenewable resource?

Natural gas is a great alternative to electricity for cooking.

Which statement is true about magnetic poles?

North and south poles attract each other.

Which statement best describes the relationship between metals and magnets?

Only some metals are attracted by magnets; these metals are called ferromagnetic.

The product of voltage times amperage is known as what?

Power

How does a change in resistance affect the conductivity of a material?

The lower the resistance, the better the conductivity