4 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
5 FuelsA “fuel” is something that can be burned to release heat and light energy. The main examples are:Coal, oil and gas are called “fossil fuels”. In other words, they were made from fossils.
6 Renewable energy sources WindHydro-electricWaveTidalBiomassGeothermal
7 Renewable vs. non-renewable fuels A ________ energy source is 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 – non-renewable, coal, wind, renewable, fossil fuels, wood, renewed
8 Non-renewable energy sources AdvantagesDisadvantagesPollution – CO2 leads to global warming and SO2 leads to acid rainCheap fuel costsCoal, oil, gas and nuclearGenerate a lot of energyFuel will run outEasy to use
9 Renewable energy sources AdvantagesDisadvantagesOften depend on the weather – is it sunny???CleanWind, tidal, solar, Waves,Won’t run outLook uglyEnergy is “dilute” – in other words, it’s very spread outEasily accessible
10 FoodFood is an energy resource. The amount of energy it contains is measured in “kilocalories” (KCal). For example, consider 100g of the following:230 KCal760 KCal160 KCal35 KCal