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Energy sources
 

Energy sources

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    Energy sources Energy sources Presentation Transcript

    • On your index card:• Summarize the difference between renewable and nonrenewable resources. Fill the front of your card, and make sure your name is on the card.
    • 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
    • CoalAdvantages Disadvantages• Abundant supply • Emits greenhouse gases and• Currently inexpensive to mine causes acid rain• Reliable and able to generate • Mining can be dangerous large amounts of power • Eventually, the coal supply will run out
    • Oil and Natural Gas
    • Oil (Petroleum)Advantages Disadvantages• Good fuel for vehicles • High carbon dioxide emissions• Economical to produce • Found in limited areas• Easy to transport • Supply may be used up soon • Environmental impact through drilling and transporting
    • Natural GasAdvantages Disadvantages• Widely available • Unavailable in many areas• Cleanest burning fossil fuel • Still pollutes some • Pipelines impact environment
    • NuclearAdvantages Disadvantages• No greenhouse gases • Although not much waste is• Produces huge amounts of produced, it is very, very energy from small amounts of dangerous. fuel. It must be sealed up and• Produces small amounts of buried for many years to allow waste. the radioactivity to die away.• Nuclear power is reliable. • 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 35 in at least 1 sentence ▫ What were the two most important points in what we just looked at? ▫ Compare/contrast the use of fossil fuels and nuclear energy. ▫ Which of the types of energy we have talked about do you feel is the best? Why? ▫ 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).
    • SolarAdvantages Disadvantages• It’s free • Expensive to build power• There’s no waste and no stations pollution • Can’t collect it at night• It will last for 5 billion years • Can be unreliable if you’re not in a sunny climate
    • WindAdvantages Disadvantages• Wind is free and requires no • Wind is unpredictable and fuel sometimes there is no wind• No waste • The land in windy areas may• Land below can still be used be expensive for farming • Can kill birds• Good for remote areas • Is noisy and can effect TV• Can become a tourist reception attraction
    • Hydroelectric
    • HydroelecticAdvantages Disadvantages• Energy is virtually free once • Expensive to build dams the dam is built • Building the dam will flood a• No waste large area• More reliable than wind and • Find the right place is difficult solar • Water quality and quantity can• Water can be stored for peak be effected downstream demands
    • Tidal
    • Tidal• Turbines are placed Turbines are placed underwater like with a dam. underwater like with a dam. Tidal turbines have to spin 180 Tidal turbines have to spin 180 degrees because the tide degrees because the tide switches directions 4 times a switches directions 4 times a day! day!
    • TidalAdvantages Disadvantages • Once youve built the • Very expensive to build. dam, tidal power is free. • Affects a very wide area - the • It produces no environment is changed for greenhouse gases or many miles upstream and downstream. other waste. • Many birds rely on the tide • It needs no fuel. uncovering the mud flats so • It produces electricity that they can feed. reliably. • Only provides power for around • Not expensive to 10 hours each day, when the maintain. tide is actually moving in or out. • Tides are totally • There are very few suitable predictable sites for tidal power stations.
    • Reflection Questions• Choose 1 and answer on page 35 in at least 1 sentence ▫ In your own words, explain solar, wind, and hydroelectric power. ▫ Brainstorm some solutions to the disadvantages mentioned for solar power. ▫ Of solar, wind, and hydroelectric, which would you most want to use and why? ▫ Draw a picture of what your life would be like using solar or wind power.
    • Biomass
    • BiomassAdvantages Disadvantages• Abundant Supply • Emits some pollution• Fewer emissions than fossil • Increases air pollution fuels • Uses fossil fuels in conversion• Cars can be easily converted to run on biomass
    • GeothermalAdvantages Disadvantages• Minimal environmental • Few places where geothermal impact is workable• Low emissions • Wells could be depleted• Low cost after initial investment
    • Reflection Questions• Choose 1 and answer on page 35 in at least 1 sentence ▫ Define biomass so a 3rd grader would understand. ▫ What could be some of the problems associated with geothermal? ▫ Where would you need to live to make geothermal a viable option as an energy source? ▫ Create a one-pane cartoon and caption about biomass.