Transcript WIND POWER
Energy: States and Resources Nature of Energy • Energy is all around you! – You can hear energy as sound. – You can see energy as light. – And you can feel it as wind. Nature of Energy • You use energy when you: – hit a softball. – lift your book bag. – compress a spring. Nature of Energy Living organisms need energy for growth and movement. Nature of Energy • Energy is involved when: – – – – a bird flies. a bomb explodes. rain falls from the sky. electricity flows in a wire. • What is energy that it can be involved in so many different activities? –Energy can be defined as the ability to do work. –If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy. The Law of Conservation of Energy • Energy can be neither created nor destroyed by ordinary means. • It can only be converted from one form to another. Energy Conversion Energy can be changed from one form to another. Changes in the form of energy are called energy conversions. (or transformations) States of Energy The most common energy conversion is the conversion between potential and kinetic energy. All forms of energy can be in either of two states: Kinetic Potential KINETIC ENERGY Energy of motion What is Potential Energy? Energy that is stored and waiting to be used later. Potential Energy Converted to Kinetic Energy… When stored energy begins to move, the object now transfers from potential energy into kinetic energy. Standing still Running THE TRADE OFF Between Potential & Kinetic Energy Energy Resources 1. Fossil Fuels 2. Nuclear Power 3. Biomass 4. Geothermal Power 5. Wind Power 6. Hydropower 7. Solar Power COAL, PETROLEUM, AND GAS Coal, petroleum, and natural gas are called fossil fuels. They are nonrenewable because they can not be replenished in a short period of time. NUCLEAR ENERGY Nuclear fission uses uranium to create energy. Nuclear energy is a nonrenewable resource because once the uranium is used, it is gone! RENEWABLE RESOURCES Renewable resources are natural resources that can be replenished in a short period of time. ● Biomass ● Geothermal BIOMASS Energy from burning organic or living matter. Why is energy from biomass renewable? Biomass Power Biomass means burning wood, dung, sugar cane or garbage. All can be replaced in a short period of time. Geothermal Power • Geothermal energy means getting heat from hot rocks within our Earth. • Renewable Geothermal Power • Hot water comes up out of the ground, and we use the heat to make steam to drive turbines and heat buildings. Perpetual • Resources that exist in continual supply, no matter how much they are used. • Hydropower (Water) • Wind Power • Solar Power Perpetual – a constant moving supply of energy. Hydroelectric Power • Hydropower means getting energy from flowing water. • Perpetual • No pollution, no fuel needed, no waste. • Building a dam means flooding a lot of land. WIND POWER - What is it? A perpetual energy that ultimately comes from the sun. Wind doesn’t cause pollution, and doesn’t need fuel. It needs a lot of generators to get a sensible amount of power. Generators need to be placed where winds are reliable. Solar Energy • Solar power is perpetual. • Solar power doesn’t cause pollution and doesn’t need fuel. • Solar cells are expensive.