1. 7Ic Hydroelectricity Hydroelectricity is generated using flowing water. Slide 1 of 9

2. 7Ic Hydroelectricity Energy from the Sun makes water evaporate. Slide 2 of 9

3. 7Ic Hydroelectricity The water vapour condenses to form clouds. Water droplets in the clouds combine and fall as rain. Slide 3 of 9

4. 7Ic Hydroelectricity Rain that falls on lands runs into rivers and lakes. Dams trap water in reservoirs in mountainous areas. Slide 4 of 9

5. 7Ic Hydroelectricity Water from the reservoir runs downhill in pipes. Slide 5 of 9

6. 7Ic Hydroelectricity The moving water turns turbines in the hydroelectric power station. The turbines turn generators, which make electricity. Slide 6 of 9

7. 7Ic Hydroelectricity What are some of the advantages and disadvantages of using hydroelectric power? Slide 7 of 9 Advantages Disadvantages

8. 7Ic Hydroelectricity Advantages Slide 8 of 9 No fuel costs. No pollution (although rotting vegetation under the water can sometimes produce methane, which contributes to global warming.

9. 7Ic Hydroelectricity Disadvantages Slide 9 of 9 Money has to be spent to build the dam, pipelines and power station. The reservoir can cover a large amount of land and destroy wildlife habitats. Hydroelectricity can only produce large amounts of electricity in wet mountain regions, or in places with large, fast-flowing rivers. The reservoir could dry up in summer if there is not enough rain.