However, there are still a lot of things that people do not know or fully understand about solar energy just yet, like what it is exactly, and how to use it to its utmost potential. In order for you to fully understand more about solar and sustainable energy, and what the future holds for it, you need to learn more about the history of solar energy. These are still used in engineering trials and demonstration practices, usually sponsored by private or government agenices. Solar cars mix the technology in bicycle, aerospace, automotive and alternative energy industries. The design of the solar vehicle is limited by the energy amount placed into the car. Active solar energy involves the use of mechanical devices in collecting, storing and distributing solar energy inside the home. Pumps, for example, are used in active solar energy water heating systems to circulate the water through the system. There are plenty of solar applications that a homeowner can use to get the most out of active solar energy. Wash a piece of the copper throughout, then use the sandpaper to take off any presence of corrosion. Lay the copper sheet on the burner. Turn the burner on to maximum heat. Watch the copper very well. You will observe that the colors change as the copper starts to oxidize, and gently transform to black. The Types There are 3 types of active solar applications that you can readily use in the home namely active solar pool heating, active solar space heating and active solar water heating. Active solar space heating can heat air inside the house by using pumps, blowers and fans that will distribute and gather heat. You can now rely on the sun to help you minimize utility and electric bills. You can even see a number of vehicles now solely powered by the sun. The disadvantage to the approach is that the power may tend to fluctuate depending on the sunlight available. Some devices may not work as well if the acquired energy from the sun is insufficient.