Energy is simply defined in Physics as the ability to do works. The World has much different energy, such as solar, nuclear, coal, .... . Solar energy helps us protect the environment, solar energy is the primary source available on Earth. This renewable resource is available in abundance. Energy is produced in the sun by nuclear fusion. Solar energy, however, is of low quality as it produces a limited amount of energy and temperature. Thus, it is usually used to heat water and air for cooking and drying. High solar energy is been converted to electricity by solar cells. It is used in calculators. Solar panels are made up of a combination of many solar cells. In artificial satellites, solar panels provide energy. Solar cookers and solar heaters are made on the basis of this principle. Nuclear energy is made from elements that are radioactive and undergo nuclear fission. To generate nuclear energy, nuclear fuels are needed such as Uranium which is easily available. Nuclear energy is produced in nuclear power plants with high protection as the products formed are harmful to us. If the radioactive wastes are disposed of safely in the environment, this will be Eco friendly and reliable energy source for our future. Coal was formed long ago by the degradation of plants under the ground under high pressure and temperature without the presence of air. It is a solid form of brown or brownish-black colored fuel. Coal was widely used conventionally as an energy source. After wood, coal was the main source of energy as a fossil fuel. Coals are of different types according to the carbon content, i.e., anthracite, bituminous, and lignite. Coal is used as it can be converted to solids, liquids, and gaseous fuel. It is very useful in the production of electricity. Also used as a raw material for drugs, medicines, explored...
I should do somethings to save energy: Set a non-ENERGY STAR air conditioning unit to “Quiet Guard” or “Power Save” mode. Get a programmable thermostat that will automatically turn your AC and heater on or off to save on energy. Always keep windows and doors tightly shut when running the AC or heater. If you have central AC, close the air vents in unused rooms to avoid cooling or heating unused spaces. Turn off kitchen or bath exhaust fans as soon as possible. Use ceiling fans to cool a room instead of turning on the AC. You can set your thermostat to slightly higher temperatures if you have ceiling fans installed!
