ENERGY

Energy

• Energy • Ability to cause change

Two categories of energy• Kinetic energy-

• Potential energy-

• Energy an object has due to its motion

• Energy stored in an object because of its position

Energy Resources and Conservation

• Energy resources –

• Energy conservation –

• anything that can be used as a source of energy to do work

• methods of energy use through insulation, increasing energy frequency, and changes in patterns of use

http://www.youtube.com/watch?v=q_fvbO2VXjc

Alternative Forms of Energy

• Nuclear- • energy stored in atomic nuclei that can be transformed into other forms of energy by complex power plants

Geothermal Energy

• Geothermal- • Heat flowing from inside the Earth

Solar Energy

• Solar- • Energy from the sun

Hydropower/Hydroelectricity• Hydroelectricity- • Electricity

produced by the kinetic power of water

Wind Energy

• Wind- • Electricity produced by the kinetic energy of wind

Biomass

• Biomass power • Plant material, vegetation, or agricultural wastes (compost) used as a fuel or energy source

Using Fossil Fuels as Sources of Energy

• Fossil fuels- • Formed when heat and pressure gradually turns the remains of organisms and plants into oil, natural gas, and coal

• takes millions of years to form

Types of Energy Resources• Nonrenewable

Resource

• Examples

• An energy resource that is used up much faster than it can be replaced

• Fossil fuels

Types of Energy Resources• Renewable

Resource

• Example

• Energy source that is replenished continually

• Hydropower/hydro-electricity

Types of Energy Resources• Inexhaustible

Resource

• Example-

• Energy source that can’t be used up by humans

• sun

Generating Electrical Energy• Generator- • -device that

transforms kinetic energy into electrical energy-in fossil fuel power plants, coal, oil, or natural gas is burned to boil water

Turbine• Turbine- • set of steam-

powered fan blades that spins a generator at a power plant to produce electrical energy