Слайд 2 The energy resources used to generate electricity can be divided into
two categories:
nonrenewable
and
renewable.
Слайд 3 Nonrenewable resources cannot be increased. We can make these supplies last
longer by using them wisely, but when they are gone we will not have any more.
Слайд 4 The majority of electricity used in the world is generated at
power plants that burn fossil fuels to heat water and make steam. The steam is highly pressurized and directed at turbine ['tɜbaɪn] blades to make them spin.
Слайд 5 The three forms of fossil fuels are
coal,
oil, and
natural
gas.
They are known as fossil fuels because they were formed from the fossilized remains of animals or plants that lived long ago.
Слайд 6Nuclear Power
Nuclear power plants use the heat from splitting atoms to convert
water into the steam that turns turbines.
Слайд 7Renewable Resources
Renewable energy resources can be replenished in a short period
of time, so they will never be all used up. Energy companies all over the world are using renewable resources more and more to generate electricity.
Слайд 8Biomass
Biomass is organic matter, such as agricultural wastes, and wood chips and
bark left over when lumber is produced. Biomass can be burned to heat water to make steam, which turns a turbine to make electricity. It can also be converted into a gas, which can be burned to do the same thing.
Слайд 9Geothermal Energy
The word "geothermal" comes from the Greek words geo, for
earth, and therme, for heat. So geothermal means "earth heat."
Слайд 10Geothermal energy is steam (or hot water that has been converted to
steam) from deep inside the earth.
Слайд 11Hydrogen
Hydrogen is a colorless, odorless gas. Hydrogen can be converted into
electricity through a chemical reaction in a device called a fuel cell. Converting hydrogen into electricity produces no pollution—only water and heat.
Слайд 12Hydropower
Hydroelectric plants use the power of falling water to turn the turbines
that help generate electricity.
Слайд 13Wave power
The energy of the ocean's waves and tides can also
be used to generate electricity with dams that force ocean water through turbines. This is called tidal energy, or wave power.
Слайд 14 The world's first wave power station is on the Scottish island
of Islay. It generates enough electricity for about 400 homes.
Слайд 15Solar Energy
Solar energy is generated without a turbine or electromagnet..
Слайд 16Special panels of solar cells, or modules, can capture sunlight and convert
it directly into electricity
Слайд 17Wind Power
Wind power is renewable energy that uses the force of the
wind to spin turbines. These spinning turbines generate electricity.