OVERVIEW CHAPTER 27: ENERGY, POWERING OUR NATION The following information is an overview of the lesson on chapter twenty-seven: energy and different ways it is produced, broken up into its main categories of NUCLEAR ENERGY - Heat is generated by breaking - - down (fission) of radioactive uranium atoms This heat boils water that creates steam The steam is trapped and forces through a passage, where this steam turns a turbine Canada is a large user of nuclear energy, because we have an abundant supply of uranium. This process creates a toxic waste, which needs to be carefully disposed of, or else it is very dangerous. Nuclear power is NOT a renewable resource HYDRO ELECTRICITY - Hydro is very similar to wind - - - power in the sense that they both involve fluids pushing rotors for the energy to be made Hydro electricity is more reliable than wind, because when using a moving water source, it will always be flowing. This is not always the case with moving air. Niagara falls is an example of where this occurs. A giant turbine is placed under the falling water, which is constantly turning the rotors. This is a renewable resource WIND ENERGY - Wind energy is a renewable - - resource Similar to hydro power, because both are turned by fluids in motion Wind is created when the cooler air fills in the gap when hotter air rises The wind pushes the rotors of a windmill, which turns the shaft When the shaft spins a series of magnets, the magnets create electricity through a coil of wire, which acts as a conductor Wind energy is very cheep, but it comes in little amounts. Most wind energy is harnessed through different types of windmills. SOLAR ENERGY - Solar energy is the cleanest of all - alternative energy sources This is also renewable. The most common type of solar energy is PV cells. (Photovoltaic) You see them in calculators and satellites. When the light hits one of the cells, the semiconductor material absorbs it The energy set electrons free, causing them to move freely. By placing a metal slide on top, we can harness this energy and store it for other uses.