And where does all that energy come from? We generate the majority of it from fossil fuels like gas, oil and coal. Some of our electricity also comes from nuclear energy. However, these types of energy do have various disadvantages:
We keep talking about energy, but what does energy actually mean, and how do you measure it?
The unit used to measure energy and work is the joule (J).
What are the disadvantages of using hydro-power in this way?
How does hydropower become electricity?
As you have just learned, people have been using the kinetic energy of water for hundreds of years to directly power machines. During the course of industrialisation, people stopped using the hydropower directly, and instead began to use electric current. But how do we use hydropower to generate electricity?
Solar energy is the energy generated by the sun through nuclear fusion; some of this energy reaches the earth as electromagnetic radiation (radiant energy). The majority of this energy is used to warm our planet.
We can also use solar technology to harness solar energy for a variety of purposes:
Conduct experiments to find answers to the following questions:
What is the function of the LED in the solar station? It serves as a charging control indicator. Once the Goldcap is fully charged, the LED lights up.
In this task, you will combine wind and solar energy. The Goldcap is used to store energy.
Wire the electrical components as shown in the building instructions. This type of circuit compensates for the disadvantages of the two tasks above.
When there is wind (mini button not activated), the house draws power from the wind. The LED is illuminated.
At the same time, the solar system is charging the Goldcap.
When the wind stops, the mini button is activated. The LED is then supplied with solar power from the Goldcap.
What if something isn't working?