energy where does our energy come from?. where does our energy come from for…? electric light...
TRANSCRIPT
ENERGY
Where does our Energy come from?
Where does our energy come from for…?
• Electric light• Mobile phones• Power for your mp3• TV• Hot Water
Energy for these things come from Energy Resources, that are converted into energy that we can easily use. Electricity is the main form of energy that we use and can power or charge what we need energy for.
To generate electricity…
1. You need an energy source, e.g. coal2. This is burnt to produce heat or steam3. The heat or steam then drives a turbine4. The turbine then can drive a generator5. The generator then produces electricity6. The electricity is then transported in
cables to where it is needed
Energy in Ohio
Energy Resources can be divided into 2
categories:1. Non-Renewable ResourcesFor example – coal, oil, gas, uranium or
ligniteOnce used these resources CANNOT be used again
2. Renewable ResourcesFor example – wind, water or solarThese resources can be used over and over again
Non-Renewable Resources: COAL
What is it? • Formed underground from decaying plant
materialHow much left in the world?• About 200 yearsAdvantages? • Plenty left• Mining is getting more efficientDisadvantages? • Pollution: CO2 emissions (linked to global
warming), SO2 (linked to acid rain)• Heavy & bulky to transport
Non-Renewable Resources:
OILWhat is it? • Formed underground from decaying animal and
plant materialHow much left in the world? • About 40 years!Advantages? • Quite easy to transport• Efficient in producing energy• Less pollution than coalDisadvantages? • Not much left• Pollution: air and danger of water pollution
through spills
Non-Renewable Resources: NATURAL GAS
What is it? • Formed underground from decaying animal and
plant materialHow much left in the world? • About 60 yearsAdvantages? • Clean, least polluting of all non-renewables• Easy to transportDisadvantages? • Some air pollution• Danger of explosions
Non-Renewable Resources: NUCLEAR
What is it? • Uses uranium, naturally found in some rocksHow much left in the world? • Not knownAdvantages? • Not much waste and few CO2 emissions
released, as well as, few other greenhouse gases
Disadvantages? • High cost to build and close down power
stations.• Waste is radioactive. Problem with getting
rid of waste safely
Coal in Three Stages: Lignite • peat is compressed to about one-fifth of
its original thickness• lowest heating valueBituminous• formed under more heat and pressure than
ligniteAnthracite• highest heating value• comes from highest pressure compression and
temperatures• cleanest burning of all the coals
Why is the term, FOSSIL FUEL used for coal, oil,
gas and lignite?
Renewable Resources: WIND
What is it? It the movement of air from high to low pressure
How much left? EndlessAdvantages? No pollutionDisadvantages? Winds change all the time, not predictable
Renewable Resources: SOLAR
What is it? Energy from the sun
How much left? EndlessAdvantages? No pollution, can be used in remote areas
Disadvantages? Can be expensive, needs sunlight At night it doesn’t work
Renewable Resources: BIO-ENERGY
What is it? Biomass and Biogas – • fermented animal or plant waste• vegetation from sustainable sourcesHow much left? EndlessAdvantages? Good availabilityDisadvantages? Can be expensive to set up
Renewable Resources: HYDRO
What is it? Movement of water drives a turbine
How much left? EndlessAdvantages? No CO2 emissions, can control flooding and provide a good water supply to an area
Disadvantages? Large areas maybe flooded. Visual and water pollution
Renewable Resources: GEOTHERMAL
What is it? Heat from the ground – often used to heat water
How much left? A lotAdvantages? No CO2 emissions
Disadvantages? Expensive and can only be used in certain parts of the world
Renewable Resources: WATER & TIDAL
What is it? Movement of sea drives turbines
How much left? EndlessAdvantages? Can produce a lot of electricity, no CO2 emissions
Disadvantages? Not many suitable sites