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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