1 / 13

KS3 Energy

KS3 Energy. The ULTIMATE energy source. The sun is the ultimate source of all our energy. For example, we often get energy from beef: BEEF comes from COWS, COWS eat GRASS, GRASS gets energy from the sun by PHOTOSYNTHESIS. The 9 types of energy. Energy changes.

alena
Download Presentation

KS3 Energy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. KS3 Energy

  2. The ULTIMATE energy source The sun is the ultimate source of all our energy. For example, we often get energy from beef: BEEF comes from COWS, COWS eat GRASS, GRASS gets energy from the sun by PHOTOSYNTHESIS

  3. The 9 types of energy

  4. Energy changes 1) Write down the starting energy: 3) Write down what energy types are given out: Electricity Light + heat 2) Draw an arrow To describe an energy change for a light bulb we need to do 3 steps: • What are the energy changes for the following…? • An electric fire • A rock about to drop • An arrow about to be fired

  5. Conservation of Energy In this example HEAT is wasted – it’s given to the surroundings. Waste energy is virtually always heat and it’s always given to the surroundings. In any energy change there is ALWAYS some “waste” energy: e.g. a light bulb: Electricity Light + heat

  6. Heat transfer 1) Conduction – this is when heat is passed on through a solid by vibrations of particles: 2) Convection – this is when “heated stuff” moves somewhere else and takes heat with it: 3) Radiation – this is when heat is moved by “heat waves” (infra-red) – this is how heat reaches us from the sun:

  7. Power stations Transformer Boiler Turbine Cooling tower Generator

  8. What does each part do? The boiler is where the fuel is burnt to boil water The steam from the boiler is used to turn a turbine The turbine is connected to the generator, which acts like a dynamo – it generates electricity out of movement The steam is cooled down and turned back into water in the cooling tower

  9. Renewable vs. non-renewable fuels A ________ energy source is blatantly one that can be _______ (“renew = make again”), e.g. _____, solar power etc. Biomass is also an example of a renewable energy source – ______ is a form of biomass. A ___________ energy source is one that when it has been used it is gone forever. The main examples are ____, oil and gas (which are called ______ ____, as they are made from fossils), and nuclear fuel. Words to use – non-renewable, coal, wind, renewable, fossil fuels, wood, renewed

  10. Non-renewable energy sources Coal, oil, gas and nuclear Advantages Disadvantages Pollution – CO2 leads to global warming and SO2 leads to acid rain Cheap fuel costs Good for “basic demand” Fuel will run out Costs a lot of money to decommission a nuclear plant Short start-up time

  11. Other ways of generating electricity… Can we drive the turbine without burning anything?

  12. Other ways of generating electricity… Wind Hydro-electric Wave Tidal

  13. Renewable energy sources Coal, oil, gas and nuclear Advantages Disadvantages Often depend on the weather – is it sunny??? Clean Won’t run out Very expensive Energy is “dilute” – in other words, it’s very spread out Easily accessible

More Related