Presentation on theme: "By: D. W., S. R., R. K., and F. B.. Nonrenewable Chemical energy Electrical energy Mechanical Energy Fossil fuels (coal, oil, natural gas, and uranium)"— Presentation transcript:
Nonrenewable Chemical energy Electrical energy Mechanical Energy Fossil fuels (coal, oil, natural gas, and uranium) Renewable Wind Hydroelectric solar biomass geothermal nuclear fusion Hydroelectric fuel cell
The major forms of energy are mechanical energy, thermal energy, chemical energy, electrical energy, electromagnetic energy, and nuclear energy.
Chemical energy is energy stored in chemical bonds An example of chemical energy is burning coal. When the fire is lit, the source of energy for it is the wood or kindling you are using. When the kindling burns, energy is released and heats the coal and its surrounding area. The energy stored in the kindling is chemical energy.
Electrical energy is energy associated with electric charges. An example would be a light bulb. The current has kinetic energy and is converted to electrical energy when going into the light bulb and through the filaments; which lights up the light bulb.
Mechanical energy is the energy associated with the motion and position of everyday objects. Mechanical energy= Kinetic energy + Potential Energy An example of mechanical energy is a wind up toy. When the toy is not moving it has potential energy. Work is done when you turn the crank the spring inside has elastic potential energy. When you let go of the springs it will spring back to its original shape. The toy has mechanical energy and then kinetic.
Fossil fuels are coal, oil, natural gas, and uranium. They come from underground. They are being used faster than we can replace them. Fossil fuels currently make up a majority of the worlds energy. They are relatively inexpensive and are usually easy to get to but they create pollution.
Wind turbines convert wind energy (KE) into electrical energy using a generator. When the wind blows into the fans (shown below) the turbines rotate to the roto shaft. Then it is converted to electrical energy. Major Advantages: low cost, no pollution, and you never run out of wind Major Disadvantages: A lot of space and a big start up cost
Hydroelectric energy is obtained through flowing water. When water flow down a hill its gravitational potential energy is converted to kinetic energy and is used to turn turbines that are attached to electric generators. Most hydroelectric plants are built on damson rivers. A dam stops the flow of water storing potential energy which is then converted to KE as it begins to flow. Major advantages: no pollution and low cost. Major Disadvantages: it disturbs the natural run of fish and/or animals, you can only have so many plants because you only have so much water.
Solar energy is sunlight that is converted to usable energy. Sunlight passes through the windows and heats either air or water and then is used to heat houses. Some items run on solar power, like calculators or cars. Sunlight can be converted into electrical energy or heat through solar cells to power certain objects. Major Advantages: no pollution Major Disadvantages: you need sunlight
Biomass energy is chemical energy stored in living things( burning wood, corn, and peat). Some corn can be turned into a fuel called ethanol to power cars. Major Advantages: low cost, readily available, and renewable Major Disadvantages: pollution and it impacts ecosystems
Geothermal energy is thermal energy stored beneath the Earth’s surface. It is mainly found near volcanoes. Water gets pumped into the ground and is converted to steam which is then used to generate electricity. It is also found near hot springs. Major Advantages: No Pollution Major Disadvantages: not widely available and you need hot earth
Nuclear fusion: When you combine nuclei to form a more massive nuclei Nuclear energy is energy stored in atoms Nuclear Fission: When you split nuclei
Hydroelectric fuel cells generate electricity by reacting hydrogen with oxygen. Hydrogen fuel can be obtained from water using electricity from solar cells. The ending product is water. Major Advantages: no pollution Major Disadvantages: not very efficient