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10 02-2013-energy sources
 

10 02-2013-energy sources

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    10 02-2013-energy sources 10 02-2013-energy sources Presentation Transcript

    • You Are My Sunshine! • Which of the following energy resources originate directly or indirectly from the sun? (Front of index card) ▫ Biomass/biofuels ▫ Coal ▫ Natural gas ▫ Geothermal ▫ Nuclear ▫ Hydroelectric ▫ Petroleum ▫ Solar Energy ▫ Tidal Energy ▫ Wind Energy • Explain your thinking: Why did you pick the answers that you picked? • (On back of index card)
    • What are the advantages and disadvantages of our energy resources?
    • Nonrenewable Resources • It’s not replaced as quickly as it is used. • Takes a long time for these to form. • Currently we depend on fossil fuels, which are nonrenewable for the majority of our energy.
    • Coal
    • Coal Advantages Disadvantages • Abundant supply • Currently inexpensive to mine • Reliable and able to generate large amounts of power • Emits greenhouse gases and causes acid rain • Mining can be dangerous • Eventually, the coal supply will run out
    • Oil and Natural Gas
    • Oil (Petroleum) Advantages Disadvantages • Good fuel for vehicles • Economical to produce • Easy to transport • High carbon dioxide emissions • Found in limited areas • Supply may be used up soon • Environmental impact through drilling and transporting
    • Natural Gas Advantages Disadvantages • Widely available • Cleanest burning fossil fuel • Unavailable in many areas • Still pollutes some • Pipelines impact environment
    • Nuclear – splitting of uranium atoms to release heat Advantages Disadvantages • No greenhouse gases • Produces huge amounts of energy from small amounts of fuel. • Produces small amounts of waste. • Nuclear power is reliable. • Although not much waste is produced, it is very, very dangerous. It must be sealed up and buried for many years to allow the radioactivity to die away. • Nuclear power is reliable, but a lot of money has to be spent on safety – if it does go wrong, a nuclear accident can be a major disaster.
    • Reflection Questions • Choose 1 and answer on page 37 in at least 2 sentences. 1. What were the two most important points in what we just looked at? 2. Compare/contrast the use of fossil fuels and nuclear energy. 3. Which of the types of energy we have talked about do you feel is the best? Why? 4. Create a simile for fossil fuels. (Fossils fuels are like ….)
    • Renewable Resources • Renewable resources can be replaced in a relatively short period of time (like your lifetime).
    • Solar Advantages Disadvantages • It’s free • There’s no waste and no pollution • It will last for 5 billion years • Expensive to build power stations • Can’t collect it at night • Can be unreliable if you’re not in a sunny climate
    • Wind Advantages Disadvantages • Wind is free and requires no fuel • No waste • Land below can still be used for farming • Good for remote areas • Can become a tourist attraction • Wind is unpredictable and sometimes there is no wind • The land in windy areas may be expensive • Can kill birds • Is noisy and can effect TV reception
    • Hydroelectric
    • Hydroelectic Advantages Disadvantages • Energy is virtually free once the dam is built • No waste • More reliable than wind and solar • Water can be stored for peak demands • Expensive to build dams • Building the dam will flood a large area • Find the right place is difficult • Water quality and quantity can be effected downstream
    • Tidal
    • Tidal • Turbines are placed underwater like with a dam. Tidal turbines have to spin 180 degrees because the tide switches directions 4 times a day! Turbines are placed underwater like with a dam. Tidal turbines have to spin 180 degrees because the tide switches directions 4 times a day!
    • Tidal Advantages Disadvantages • Once you've built the dam, tidal power is free. • It produces no greenhouse gases or other waste. • It needs no fuel. • It produces electricity reliably. • Not expensive to maintain. • Tides are totally predictable • Very expensive to build. • Affects a very wide area - the environment is changed for many miles upstream and downstream. • Many birds rely on the tide uncovering the mud flats so that they can feed. • Only provides power for around 10 hours each day, when the tide is actually moving in or out. • There are very few suitable sites for tidal power stations.
    • Reflection Questions • Choose 1 and answer on page 37 in at least 2 sentences. 1. In your own words, explain solar, wind, and hydroelectric power. 2. Brainstorm some solutions to the disadvantages mentioned for solar power. 3. Of solar, wind, and hydroelectric, which would you most want to use and why? 4. Draw a picture of what your life would be like using solar or wind power.
    • Biomass
    • Biomass Advantages Disadvantages • Abundant Supply • Fewer emissions than fossil fuels • Cars can be easily converted to run on biomass • Emits some pollution • Increases air pollution • Uses fossil fuels in conversion
    • Geothermal Advantages Disadvantages • Minimal environmental impact • Low emissions • Low cost after initial investment • Few places where geothermal is workable • Wells could be depleted
    • Reflection Questions • Choose 1 and answer on page 37 in at least 2 sentences. 1. Define biomass so a 3rd grader would understand. 2. What could be some of the problems associated with geothermal? 3. Where would you need to live to make geothermal a viable option as an energy source? 4. Create a one-pane cartoon and caption about biomass.