The National Academies: What You Need To Know About Energy

The National Academies

What You Need To Know About Energy

What do you know about energy?

How much of the world's CO2 is released by the United States?

  • Sorry, that’s incorrect.

    Almost 20% of the world's CO2 is released by the United States.

  • Sorry, that’s incorrect.

    Almost 20% of the world's CO2 is released by the United States.

  • Correct!

    Almost 20% of the world's CO2 is released by the United States.

In 2008, of the four economic sectors, which used the most energy in the United States?

  • Sorry, that’s incorrect.

    In 2008, industry used 31% of the total energy used; next was transportation at 28%, then residential at 22%, and commercial at 19%.

  • Sorry, that’s incorrect.

    In 2008, industry used 31% of the total energy used; next was transportation at 28%, then residential at 22%, and commercial at 19%.

  • Sorry, that’s incorrect.

    In 2008, industry used 31% of the total energy used; next was transportation at 28%, then residential at 22%, and commercial at 19%.

  • Correct!

    In 2008, industry used 31% of the total energy used; next was transportation at 28%, then residential at 22%, and commercial at 19%.

Most of the world's energy originates from which two primary sources:

  • Correct!

    The energy we capture for use on Earth comes largely from the sun or from nuclear forces local to our own planet.

  • Sorry, that’s incorrect.

    The energy we capture for use on Earth comes largely from the sun or from nuclear forces local to our own planet.

  • Sorry, that’s incorrect.

    The energy we capture for use on Earth comes largely from the sun or from nuclear forces local to our own planet.

Of the following fossil fuels, which is typically the least expensive for its energy content?

  • Sorry, that’s incorrect.

    In 2005, a million Btu of energy from coal cost approximately $2, versus $5 for natural gas and $10 for oil. However, prices can fluctuate due to changes in the economy and new government policies.

  • Sorry, that’s incorrect.

    In 2005, a million Btu of energy from coal cost approximately $2, versus $5 for natural gas and $10 for oil. However, prices can fluctuate due to changes in the economy and new government policies.

  • Correct!

    In 2005, a million Btu of energy from coal cost approximately $2, versus $5 for natural gas and $10 for oil. However, prices can fluctuate due to changes in the economy and new government policies.

Which of the following energy sources releases carbon dioxide when burned?

  • Sorry, that’s incorrect.

    Gasoline, diesel fuel, and natural gas all release CO2 when burned.

  • Sorry, that’s incorrect.

    Gasoline, diesel fuel, and natural gas all release CO2 when burned.

  • Sorry, that’s incorrect.

    Gasoline, diesel fuel, and natural gas all release CO2 when burned.

  • Correct!

    Gasoline, diesel fuel, and natural gas all release CO2 when burned.

What percentage of the coal mined in the United States was used to generate electricity in 2006?

  • Sorry, that’s incorrect.

    90% of the coal mined in the United States was used to generate electricity in 2006.

  • Sorry, that’s incorrect.

    90% of the coal mined in the United States was used to generate electricity in 2006.

  • Correct!

    90% of the coal mined in the United States was used to generate electricity in 2006.

In 2008, approximately how much of the oil used in the U.S. was imported?

  • Sorry, that’s incorrect.

    In 2008, the U.S. imported about 66% of its oil supply. This percentage is expected to grow even higher over the next two decades.

  • Sorry, that’s incorrect.

    In 2008, the U.S. imported about 66% of its oil supply. This percentage is expected to grow even higher over the next two decades.

  • Correct!

    In 2008, the U.S. imported about 66% of its oil supply. This percentage is expected to grow even higher over the next two decades.

The consumption of energy in the United States is projected to rise by how much between now and 2030?

  • Sorry, that’s incorrect.

    U.S. consumption of energy sources is projected to rise by 13% between now and 2030.

  • Correct!

    U.S. consumption of energy sources is projected to rise by 13% between now and 2030.

  • Sorry, that’s incorrect.

    U.S. consumption of energy sources is projected to rise by 13% between now and 2030.

Which of the following is frequently used as a unit of measurement for the energy content of fuels?

  • Sorry, that’s incorrect.

    The British Thermal Unit, or Btu, is frequently used as a measure for energy content of fuels. One gallon of gasoline contains about 124,000 Btu.

  • Correct!

    The British Thermal Unit, or Btu, is frequently used as a measure for energy content of fuels. One gallon of gasoline contains about 124,000 Btu.

  • Sorry, that’s incorrect.

    The British Thermal Unit, or Btu, is frequently used as a measure for energy content of fuels. One gallon of gasoline contains about 124,000 Btu.

  • Sorry, that’s incorrect.

    The British Thermal Unit, or Btu, is frequently used as a measure for energy content of fuels. One gallon of gasoline contains about 124,000 Btu.

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Energy Hands-on

Energy Defined

Clean Coal

Coal burned in power plants equipped with technologies that greatly reduce the emission of pollutants such as sulfur, nitrogen, mercury, and, potentially, carbon dioxide.

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