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24 April, 19:10

Think Critically:

A lightbulb converts 10 percent of the electrical energy it uses into radiant energy. Make a hypothesis about the other form of energy produced.

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Answers (1)
  1. 24 April, 19:23
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    Plants Almost 90 percent of the electrical

    energy generated in the United States is produced by Oil

    nuclear and fossil fuel power plants, as shown in 3%

    Figure 15. Other types of power plants include hydro - Coal Gas

    51%

    electric (hi droh ih LEK trihk) and wind. Hydroelec - 14%

    tric power plants transform the kinetic energy of Hydro

    moving water into electrical energy. Wind power 9%

    plants transform the kinetic energy of moving air into

    electrical energy. In these power plants, a generator Nuclear Other

    converts the kinetic energy of moving water or wind 20% renewable

    3%

    to electrical energy.

    To analyze the energy transformations in a power

    plant, you can diagram the energy changes using arrows. A coal - Figure 15 The graph shows

    burning power plant generates electrical energy through the fol - sources of electrical energy in the

    lowing series of energy transformations. United States.

    chemical thermal kinetic kinetic electrical Name the energy source that you

    energy → energy → energy → energy → energy think is being used to provide the

    electricity for the lights overhead.

    of coal of water of steam of turbine out of

    generator

    Nuclear power plants use a similar series of transformations.

    Hydroelectric plants, however, skip the steps that change water

    into steam because the water strikes the turbine directly.

    Summary Self Check

    Changing Forms of Energy 1. Describe the conversions between potential and

    kinetic energy that occur when you shoot a basketball

    • Heat usually is one of the forms of energy pro - at a basket.

    duced in energy transformations.

    2. Explain whether your body gains or loses thermal

    • The law of conservation of energy states that energy if your body temperature is 37°C and the

    energy cannot be created or destroyed; it can temperature around you is 25°C.

    only change form. 3. Describe a process that converts chemical energy to

    thermal energy.

    • The total energy doesn’t change when an

    energy transformation occurs. 4. Think Critically A lightbulb converts 10 percent of

    the electrical energy it uses into radiant energy.

    • As an object rises and falls, kinetic and poten - Make a hypothesis about the other form of energy

    tial energy are transformed into each other, produced.

    but the total energy doesn’t change. 5. Use a Ratio How many times greater is the amount of

    electrical energy produced in the United States by

    Generating Electrical Energy coal-burning power plants than the amount produced

    by nuclear power plants?

    • A generator converts kinetic energy into elec-

    trical energy.

    • Burning fossil fuels produces thermal energy

    that is used to boil water and produce steam.

    • In a power plant, steam is used to spin a tur-

    bine which then spins an electric generator.
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