use and conservation of energy

using energy more efficiently

We can get more work out of the energy we use. Table 20.3 show some ways to use energy more efficiently. By getting more bang for the buck, we wont need to use as much energy overall. Does your family use energy efficiently? How could you find out? Use of Energy More Efficient Use Another way to use energy more efficiently is with Energy Star appliances. They carry the Energy Star logo, shown in Figure 20.14. To be certified as Energy Star, the appliance must use less energy. Energy Star appliances save a lot of energy over their lifetime. What if millions of households used Energy Star appliances? How much energy would it save?

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energy resources

Figure 20.11 shows the energy resources used in the U.S. The U.S. depends mainly on fossil fuels. Petroleum is used more than any other resource. Renewable energy resources, such as solar and wind energy, could provide all the energy we need, but they are not yet widely used in the U.S.

using energy to get energy

We must use energy to get energy resources. This is true of non-renewable and renewable energy. Getting fossil fuels so that they can be used takes many steps. All of these steps use energy. 1. 2. 3. 4. 5. Fossil fuels must be found. The resources must be removed from the ground. These resources need to be refined, some more than others. Fossil fuels may need to be changed to a different form of energy. Energy resources must be transported from where they are produced to where they are sold or used. Consider petroleum as an example. Oil companies explore for petroleum in areas where they think it might be. When they find it, they must determine how much is there. They must also know how hard it will be to get. If theres enough to make it worthwhile, they will decide to go for it. To extract petroleum, companies they must build huge rigs, like the one in Figure 20.12. An oil rig drills deep into the ground and pumps the oil to the surface. The oil is then transported to a refinery. At the refinery, the oil is heated. It will then separate into different products, such as gasoline and motor oil. Finally, the oil products are transported to gas stations, stores, and industries. At every step, energy is used. For every five barrels of oil we use, it takes at least one barrel to get the oil. Less energy is needed to get renewable energy sources. Solar energy is a good example. Sunlight is everywhere, so no one needs to go out and find it. We dont have to drill for it or pump it to the surface. We just need to install solar panels like the ones in Figure 20.13 and let sunlight strike them. The energy from the sunlight is changed to electricity. The electricity is used to power lights and appliances in the house. So solar energy doesnt have to be transported.

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using energy

Think about your typical day. How do you use energy? Do you take a shower when you first get out of bed? What about taking a shower uses energy? It takes energy to heat the water and to pump the water to your home. Do you eat a hot breakfast? Energy is used to cook your food. Do you ride a bus or have someone drive you to school? Motor vehicles need energy from fossil fuels to run.

energy use in the u.s.

Figure 20.10 shows the major ways energy is used in the U.S. A lot of energy is used in homes. In fact, more energy is used in homes than in stores and businesses. Even more energy is used for transportation. A lot of fuel is necessary to move people and goods around the country. Industry uses the most energy. Industrial uses account for one-third of all the energy used in the U.S.

conserving energy

Nonrenewable energy resources will run out before long. Using these energy resources also produces pollution and increases global warming. For all these reasons, we need to use less of these energy sources. We also need to use them more efficiently.

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using less energy

There are many ways to use less energy. Table 20.2 lists some of them. Can you think of other ways to use less energy? For example, how might schools use less energy? Use of Energy Transportation How to Use Less Plan ahead to reduce the number of trips you make. Take a bus or train instead of driving. Walk or bike rather than ride. Home Unplug appliances when not in use. Turn off lights when you leave a room. Put on a sweater instead of turning up the heat. Run the dishwasher and washing machine only when full.

instructional diagrams

No diagram descriptions associated with this lesson

questions

Saving energy in industry is

-->  a. possible if equipment is designed to be efficient

b. possible if new materials are used

c. not possible, since little energy is used

d. none of these.

In the U.S., more energy is used for transportation than for any other single purpose.

a. true

-->  b. false

Nonrenewable energy resources used in the U.S. include nuclear energy.

-->  a. true

b. false

What are some ways residences can use less energy?

a. Turn off lights when not in use

b. Only run appliances when necessary

c. Use a fan instead of an air conditioner

-->  d. All of the above

The renewable energy resource that is used most in the U.S. is solar energy.

a. true

-->  b. false

What person of the energy use in the United States is used for transportation?

a. 14%

-->  b. 28%

c. 45%

d. 67%

Solar energy usually must be transported long distances to be useful.

a. true

-->  b. false

The cost of an energy source depends on

a. the cost of equipment needed to harness it

b. the cost of transporting it

c. its energy efficiency

-->  d. all of these

The purpose of solar panels is to prevent sunlight from overheating a home.

a. true

-->  b. false

Conserving energy

a. is expensive because you have to buy special equipment

b. reduces costs because you create energy from less expensive sources

-->  c. reduces costs because you use less energy

d. All of these

Most nonrenewable energy resources will last thousands of years if we conserve them.

a. true

-->  b. false

Collecting sunlight for solar energy requires solar energy power plants.

a. true

-->  b. false

You can save more energy by unplugging appliances than just turning them off.

-->  a. true

b. false

A car uses gasoline more efficiently if it is driven faster than 55 mi/hr.

a. true

-->  b. false

You can save electricity by using compact fluorescent light bulbs.

-->  a. true

b. false

If the cost of oil goes up, sources that were too expensive to extract may become economical.

-->  a. true

b. false

fuel that is refined from petroleum

a. industry

-->  b. gasoline

c. solar energy

d. refinery

e. petroleum

To increase energy efficiency, be sure that equipment is running well.

-->  a. true

b. false

energy resource that is used more than any other in the U.S.

a. industry

b. gasoline

c. solar energy

d. refinery

-->  e. petroleum

Conserving resources cuts down on trash.

-->  a. true

b. false

plant that separates petroleum into different products

a. industry

b. gasoline

c. solar energy

-->  d. refinery

e. petroleum

example of a renewable energy resource

a. industry

b. gasoline

-->  c. solar energy

d. refinery

e. petroleum

The best energy source would be one that supplies a lot of energy and takes a lot of energy to make it

a. true

-->  b. false

Individuals can only do a little to increase energy efficiency because most energy is used by industry.

a. true

-->  b. false

largest single use of energy in the U.S.

-->  a. industry

b. gasoline

c. solar energy

d. refinery

e. petroleum

Which of the following uses the most total energy in the U.S.?

a. stores.

-->  b. homes.

c. businesses.

d. shopping malls.

Of all the energy used in the U.S., industrial uses account for

a. 17 percent.

b. 21 percent.

c. 28 percent.

-->  d. 33 percent.

The U.S. depends for energy mainly on

a. wind.

b. sunlight.

-->  c. fossil fuels.

d. flowing water.

Fossil fuels include

a. coal.

b. petroleum.

c. natural gas.

-->  d. all of the above

The first step in obtaining and using fossil fuels is

a. changing fossil fuels to different forms of energy.

b. removing fossil fuels from the ground.

-->  c. finding fossil fuel reserves.

d. refining fossil fuels.

Petroleum is separated into different products by

a. freezing.

b. melting.

c. cooling.

-->  d. heating.

Obtaining, refining, and transporting oil require energy. For every 5 barrels of oil we use, the oil required for these purposes is

-->  a. 1 barrel.

b. 2 barrels.

c. 3 barrels.

d. 4 barrels.

diagram questions

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