Energy Sources

HMMMM....What do you

think nonrenewable resources are?

Break it down...

Nonrenewable?

Resource?

NONRENEWABLE RESOURCES

A nonrenewable resource is a natural resource that cannot be re-made or re-grown at the same rate in which it is

used.

NUCLEAR ENERGY Uses uranium to

create energy.

Nuclear energy is a nonrenewable

resource because once the uranium

is used, it is gone!

FOSSIL FUELS

Coal, oil (petroleum), and natural gas are

known as fossil fuels because they are

made of the fossilized remalns of prehistoric plants and animals;

they arenonrenewable because they can not be re-made in a short

period of time.

HOW IS COAL MADE ???

HOW ARE OIL AND GAS MADE ???

WHAT WAS THE DIFFERENCE BETWEEN COAL AND OIL/GAS?

HMMMM....

If nonrenewable resources are resources that

cannot be re-made at a scale

comparable to its consumption, what

are renewable resources?

Renewable Resources•Renewable resources are natural resources that can be replenished in a short period of time.

•Solar•Hydroelectric•Wind•Biomass•Geothermal•Tidal

Solar Energy•Energy from the sun•The sun gives off energy in the forms of light and heat•Advantages - solar energy does not cause pollution and will not run out for billions of years (it’s a perpetual resource– no end in sight)•Disadvantages – it’s only available when the sun is out and it is spread out so it needs to be collected from a large area

Ways to Capture Solar Energy•Solar power plants – use giant mirrors to heat tanks of water •Solar cells – works like a battery- when the sunlight hits the cell a current is produced; currently only useful for small devices•Solar heating – captures the sun’s energy and uses fans to distribute the heat

Solar Power Plant

Solar House

Stop and Discuss•What is solar energy?•Why is solar renewable?•Can we have solar energy here in North Carolina? Why or why not?

Hydroelectric Power•Electricity produced by flowing water

•Advantages – flowing water supplies a steady source of energy, it’s inexpensive once a dam and power plant are built and it doesn’t create air pollution

•Disadvantages – most suitable rivers have already been dammed and dams can have a negative effect on the environment

Hydroelectric Power Plant

Wind Energy•Energy from the wind

•Wind is used to turn a turbine and generate electricity

•Windmills generate large amounts of power

•Advantages – does not cause pollution

•Disadvantages – wind is not consistent, generators are noisy and can be destroyed in very strong winds, wind farms can take up a lot of space

Stop and Discuss•What is hydroelectric energy?•Can we use hydroelectric energy here in NC? Why or why not?•What is wind energy?•Can we use wind energy here in NC? Why or why not?

Biomass Fuels•Fuels made from living things

•Wood, sugar cane, corn, gasohol (gasoline combined with alcohol), methane, soybeans, etc.

•Advantages – renewable and can use them in a variety of ways

•Disadvantages – producing enough to be helpful is expensive and it can take several years in order to replace the living things that were used

•Captures the intense heat from Earth’s interior near the magma and uses it to create steam•Advantages – unlimited source of energy and is fairly inexpensive•Disadvantages – there are only a few places on Earth where magma is close to the surface so you need to drill deep wells– an expensive process

Geothermal Energy

Tidal Power•Is similar to how hydroelectric power is generated, but uses giant dams built across a coastal area

•When the tide goes in and out, the flowing water is used to turn turbines and generate electricity

•Advantages: tides are perpetual (never ending), no waste is produced, it’s not expensive to maintain, it produces consistent energy•Disadvantages: Building a large dam can be very expensive and can destroy wildlife and habitats; can only generate power while the tides are actually moving in or out; only 20 sites in the entire world have been identified as a potential tidal energy plant site.

Stop and Discuss•What are biomass fuels?•What is geothermal energy?•What is tidal power?•Can we use these in NC? Why or why not?

Classwork/HomeworkFill out Energy Resources Venn Diagram– answer the two questions below on the back of the diagram-- place in your core tray when finished.

1.Why haven’t renewable resources replaced fossil fuels?

2.Which renewable resource do you think would be most effective at replacing fossil fuels?

Use complete sentences and explain your reasons fully; put in your core tray when finished