Presentation on theme: "Energy and Energy Resources"— Presentation transcript:
1 Energy and Energy Resources Chapter 24Sections 1, 2 and 3
2 Section 1: What is Energy? Energy: is the ability to do work.There are two types: Kinetic Energy and Potential Energy.
3 Kinetic Energy: Kinetic Energy is energy from motion. Increases as an object moves faster.Increases as mass of an object increases.
4 Potential Energy:Energy stored in an object due to its position.
5 Energy comes in different forms……. Energy that increases as temperature increases is thermal energy.Chemical energy – energy stored in chemical bonds.Radiant Energy- light energyEnergy from electricity is electrical energy.The nucleus of an atom contains nuclear energy.
6 How does Kinetic Energy and Potential Energy differ?
7 Section 2: Energy Transformations Energy is constantly changing from one form to another.Law of Conservation of Energy- Energy is never created or destroyed; it merely changes form.Energy can be transferred from kinetic to potential energy and back to kinetic.
8 Machines transform energy from one form to another. Chemical energy can be transferred to kinetic, radiant, thermal, or electrical energy.Electrical energy can be transformed to kinetic, chemical, electrical, or thermal energy.Unlike other forms of energy, thermal energy is not easy to store.
9 Turbines:the kinetic energy is converted to electrical energy by a generator at a power plant.
10 What form of energy is the most difficult to store?
11 Section 3: Sources of Energy Energy comes from either the Sun or from radioactive atoms in the Earth.
12 Fossil Fuels: Include oil, natural gas, and coal. Contain chemical energy from the Sun’s radiant energy via photosynthesis.Non-renewable resources such as fossil fuels are used up faster then they can be replaced.
13 Nuclear energy comes from the nuclei of uranium atoms. Hydroelectricity from potential energy of water is a renewable resource.
14 Alternative Resources: of Energy may be safer for people and the Environment. Solar energy - can be captured in thermal collectors or photovoltaic collectors.Geothermal energy- thermal energy contained in hot magma.Windmills- can generate electricity without polluting the environment.
15 Conserving energy will help prevent energy shortages and allow fossil fuels to last longer.