3.3b Geothermal power LO’s:

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Presentation transcript:

3.3b Geothermal power LO’s: Describe how Geothermal power can be used to generate electricity. Explain that geothermal energy comes form energy released by radioactive substances deep within the earth. Evaluate advantages and disadvantages of using geothermal energy. 4-6 6-8 6-8 Keywords Geothermal energy Radioactive Hot rocks Bore hole turbine Starter Show clip ‘old faithful’ Show clip ‘geothermal energy in Iceland’ Main Activity Work through the PPT PRES ‘geothermal power’ Complete questions from AQA text book p 40 -43 Lonsdale work sheet on renewable energy Plenary Discuss answers to questions Homework: Worksheet: Phys FDN text Q ‘Generating electricity from the sun and the earth

Q1a. The source of geothermal energy is the energy released by radioactive substance deep within the earth * the surrounding rocks are heated up and water turned to steam for electrical generation Q1b. Geothermal energy is more reliable than solar energy because: * geothermal energy is not weather dependent

Q2. a. X cells generate 0.2 W from each cell = 300 W 300W/ 0.2W = 1500 cells Q2. b. Batteries are used when the satellite is in the earth’s shadow.

Q3 a. Kilowatt hours = kilowatts x hours = 4800 kwh Q3 b * Advantage of geothermal energy: renewable , short start up time, no waste * Disadvantage of geothermal energy: Very limited locations, Expensive to build

Miss out this Q until sp ht capacity is covered in Y10 Qa a. Energy per sec transferred = mass/sec x c x temp change = 0.01 kg/s x 4200 J/kg/C x ( 35-14) C = 0.01 x 4200 x 21 = 882 J/s Qa a. Energy per sec transferred = mass/sec x c x temp change energy /sec = temp change mass /sec x c 882 = 30 C so output temp = (14 + 30) C = 44C 0.007 x 4200