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Technology 1-2 ESO – Unit 12 RENEWABLE SOURCES OF ENERGY extra activities

1 –  In the following list there are two things that affect the amount of electricity produced by a hydroelectric dam. Select the correct answers and explain why you think they are correct:

  • a) The height of the dam.
  • b) The width of the dam.
  • c) The dam is in a windy location.
  • d) The amount of water flowing in the river.

2 –  In the following list there are two things that affect the amount of hot water produced by a solar collector. Select the correct answers and explain why you think they are correct:

  • a) The size of the house.
  • b) If it is day or night.
  • c) The size of the collector.
  • d) The distance from a river.

3 –  Watch the video on “How does a wind turbine work?” and answer:

  • a) What is the function of the “wind vane”?
  • b) What moves the blades?
  • c) The video says that the blades can be “as long as 60 m each”, but there are now wind turbines with larger blades, research and find how long are the largest blades today.
  • d) Why the turbine stops spinning when there are strong winds?
  • e) What is the mission of the gear box?
  • f) What shaft moves the generator?
  • g) What is the function of the transformer and also of the substation?

4 –  Watch the video on “Photovoltaic Solar Cell” and answer:

  • a) What are the parts of a “solar cell”?
  • b) What happens when the photons go to the cell?