Renewable 15 %
Figure [ 1 ] : Pie chart showing the amount of energy use in the world in the year 2008
Every country in the world uses energy. For example: to cook. It is becoming one of the basic needs in life. But where does the energy come from? In the year 2008, 85% of the power that we are using was nonrenewable energy, which means that someday, these energies will be gone. However, right now, there are people who have started using renewable energy such as solar energy. There are more than 7 billion people in the world right now and it will keep rising while the energy resources are depleting. Even though there are many energies that are renewable, the renewable energies are harder to make use of, which is one of the reasons why not many people use them. Also, they require some advanced technology. If we don’t find something else to replace oil, coal and natural gas, we won’t have the energy to use in the future.
One of the forms of the renewable energy is solar energy. Solar energy uses energy from sunlight to create energy for our home. Sunlight is a clean, renewable resource. There are many ways to get energy from sunlight, such as the photovoltaic (PV) panels, converting sunlight into electricity and solar electricity, using the sun’s heat to produce electricity. Solar cells, or the photovoltaic panels, convert sunlight directly into electricity. We can often find solar cells in calculators and watches. Since solar cells are made up of semiconducting materials, materials whose conductivity will increase with temperature, sunlight will lose their electrons, allowing the electrons to flow through semiconducting materials to produce electricity when sunlight is absorbed. Solar electricity is separated into three kinds: parabolic-trough, dish/engine, and power tower. Parabolic-trough concentrates the sunlight through mirrors. The mirror will be tilted towards the sun, heating the oil that is flowing in...