1. 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
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

2. 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

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

4. 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

5. 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
= kg/s x J/kg/C x ( 35-14) C
= x 4200 x 21
= J/s
Qa a. Energy per sec transferred = mass/sec x c x temp change
energy /sec = temp change
mass /sec x c
= C so output temp = ( ) C = 44C
0.007 x 4200