Presentation on theme: "Renewable vs. Non-Renewable. Fission Fission - a nuclear reaction in which a neutron strikes a relatively large atomic nucleus, which then splits."— Presentation transcript:
Fission Fission - a nuclear reaction in which a neutron strikes a relatively large atomic nucleus, which then splits into two or more parts. Nuclear Energy
Nuclear fusion fusion - the reaction that powers the Sun and other stars. This occurs when lighter nuclei are forced together to produce heavier nuclei and heat is released. (ex: 2 Hydrogen turn into 1 Helium) Fusion Fusion is a promising, unlimited source of energy in the future, but so far scientists have had difficulty containing the heat that is produced. Joint European Torus (JET) in England
AdvantagesDisadvantages No air pollution is producedPossibility of accidents Highly powerful and abundantDisposal of the radioactive waste Countries can limit their need for imported oil Depleted Uranium may be used in nuclear weapons (dirty bombs) Advantages and Disadvantages of Nuclear Energy
Radioactive Radioactive waste: nuclear fuel no longer produces enough heat to be used in a power plant but continues to emit radioactivity. This waste must be stored in special, highly secure locations because of the danger to living organisms. Radioactive Waste
Biomass Wood, Charcoal and Manure- burned to heat homes throughout the world. Ethanol and Biodiesel (biofuels)- used as substitutes for gasoline and diesel fuel.
Is burning biomass (such as wood) is better than burning coal? Generally, yes: Coal is carbon that has been buried for millions of years and was out of circulation until we began to use it. This results in a rapid increase in the concentration of carbon dioxide in the atmosphere. The carbon found in biomass was recently in the atmosphere as carbon dioxide, taken in by the tree. By burning it we put carbon back into the atmosphere - continuing the cycle.
Hydroelectricity- Hydroelectricity- electricity generated by the kinetic energy of moving water. The pressurized water behind a dam spins a turbine, generating electricity. This is the second most common form of renewable energy in the world.
Run-of-the-river systems: Run-of-the-river systems: water is held behind a dam and runs through a channel before returning to the river. Water impoundment: Water impoundment: water is stored behind a dam and the gates of the dam are opened and closed controlling the flow of water. Tidal systems: Tidal systems: the movement of water is driven by the gravitational pull of the Moon.
Active solar energy- Active solar energy- capturing the energy of sunlight with the use of a pump or photovoltaic cell and generating electricity.
Passive Solar Energy passive Using passive solar energy can lower your electricity bill without the need for pumps or other mechanical devices. Example: building the house with windows along a south-facing wall which allows the Sun’s rays to warm the house.
Geothermal energy- Geothermal energy- using the heat from natural radioactive decay of elements deep within Earth as well as heat coming from magma near the surface.
Wind energy- Wind energy- using a wind turbine to convert kinetic energy into electrical energy. 1. wind turns the wind turbine blade 2. the gear box transfers mechanical energy to the generator 3. generator converts mechanical energy into electrical energy 4. electricity is transferred to the grid
Fuel cell- Fuel cell- a device that operates like a common battery where electricity is generated by a reaction between two chemicals.