is Energy? Energy does things for us. It moves cars along the road and boats on
bakes a cake in the oven and keeps ice frozen in the freezer.
Energy makes our bodies grow and allows our minds to think. Energy is
a doing, moving, working thing. Energy is the ability to do work.
- Forms of Energy:
puts something in motion
energy stored in food, wood, coal, petroleum and other fuels.
energy of moving electrons
- Thermal-- heat
energy locked in the nucleus of the atom.
Sources of Energy:
Energy sources are classified into two groups: Renewable and Nonrenewable.
In the United States most of our energy comes from nonrenewable energy
sources. Coal, petroleum, natural gas, propane, and uranium are nonrenewable
because their supplies are limited.
- Renewable energy sources include biomass (trees), geothermal (heat from
the earth), hydropower (water), solar (sun) and wind (air). They are called
renewable energy sources because they are replenished in a short time.
- Biomass is
any organic matter (anything that was once alive) that can be used
as an energy source. Wood, crops, yard, and animal waste are examples
of biomass. People have used biomass longer than any other energy source.
For thousands of years, people have burned wood to heat their homes
and cook their food. Biomass gets it's energy from the sun. Plants
absorb sunlight in a process called photosynthesis. Biomass is called
a renewable energy source because we can grow more in a short period
- Geothermal comes
from the Greek word geo (earth) and therme (heat). Geothermal energy
is heat inside the earth. The inside of the earth is very hot. Sometimes
this heat comes near the surface. We can use this heat to warm our
homes. We can make electricity with it. Geothermal energy is everywhere
under the ground. Geothermal energy is clean energy. No fuel is burned,
so there is no pollution. We won’t run out of geothermal energy.
It is a renewable.
- Hydro means
water. Hydropower is energy we make with moving water. Moving water
has a lot of energy. We use that energy to make electricity. The water
on earth will always be there. We won’t run out of it. That’s
why we call hydropower a renewable energy source. Hydropower is a clean
source of energy.
- Solar energy
is the energy from the sun. Solar energy is free and clean. There is
enough for everyone. And we will never run out of it. Solar energy
is renewable. The sun will keep making energy for millions of years.
- Wind is
moving air. We can use the energy in wind to do work. As long as the
sun shines, there will be winds on the earth. We will never run out
of wind energy It is a renewable energy source. It is also free. We
can use the wind energy to make electricity.
to learn about Electricity!