Ch. 2 Renewable/Nonrenewable Resources

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Presentation transcript:

Ch. 2 Renewable/Nonrenewable Resources The law of conservation of energy tells us that we can’t get something for nothing, but we refuse to believe it.” Isaac Asimov

From Fossil Fuels to Electricity How does coal form?

Coal Formation Coal starts out as the remains of sea creatures decompose and are buried by ocean floor sediments. The first stage of formation is called Peat Peat is compressed and squeezed over thousands of years until it becomes Lignite Lignite becomes Bituminous Coal Bituminous Coal eventually becomes Anthracite Coal Anthracite Coal is over 90% pure Carbon and burns very cleanly

How do we know Electricity is important? The frustration mounted when we have blackouts is evidence of our dependence on electricity. Also confirmed by our lack of blackouts.

PROBLEM: Out-pacing infrastructure.

What do run with electricity! Home Work Industry Transportation

Delivery Enough electricity to meet the needs of thousands is transported through wires the size of a quarter.

How is it delivered to your home?

Electricity Production Coal Fired Plant Nuclear Fired Waste Incinerators Wind Power Hydroelectric

Pennsylvania In Pennsylvania – Almost all of the electricity is produced by the burning of coal and hydroelectric plants.

Nuclear Energy What do you know about nuclear energy? Defined as the energy released when atoms are broken apart.

Two Processes Nuclear Fission Nuclear Fusion

Nuclear Fission Nuclear fission occurs when subatomic bonds that hold an atom together are broken. Large amounts of energy are given off. Think of incision: means to cut.

Nuclear Fission Over Head

Nuclear Pros one gram of U235 can deliver as much energy as two tons of coal. Reactors can run for years without refueling and do not produce CO2 or other greenhouse gases.

Nuclear Cons We have no permanent disposal system for the nuclear waste. There have been several “meltdowns” in the industry and they have taken the lives of many people. How does a “meltdown” occur?

Past Accidents Three Mile Island 1979 Chernobyl 1986 China 1999

Chernobyl

Nuclear Fusion

Sustainable Future What does sustainable mean? What is renewable? What is nonrenewable?

Non Renewable Fossil Fuels Coal Oil Nuclear Fuel Land

Renewable Resources Solar energy Passive Solar Heat Active Solar Heat Wind Hydroelectric Biomass

Generator Turbine Turbine Condensation Tank Cooling Tower Hot Water

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