Energy & Power Unit 5, Lesson 1 Explanation
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1 Energy & Power Unit 5, Lesson 1 Explanation
2 The Unit Big Idea The designed world is the product of a design process, which provides ways to turn resources - materials, tools and machines, people, information, energy, capital, and time - into products and services.
3 The Lesson Big Idea Advancements in the processing and controlling of energy resources have been an enabling factor in the development of technology.
4 First Law of Thermodynamics Energy cannot be created or destroyed, it can be converted from one form to another. For example, the gasoline (chemical energy) in a car is converted to heat (thermal energy) and movement (mechanical energy).
5 Forms of Energy The major forms of energy are: Thermal Radiant (light) Electrical Mechanical Chemical Nuclear
6 Forms of Energy Defined Thermal energy: or heat, is the vibration and movement of the atoms and molecules within substances Radiant energy (light): is electromagnetic energy that travels in transverse waves Electrical energy: energy made available by the flow of electric charge through a conductor.
7 Forms of Energy Defined Mechanical energy: energy stored in the movement of objects Chemical energy: is energy stored in the bonds of atoms and molecules. Biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Nuclear energy: is energy stored in the nucleus of an atom the energy that holds the nucleus together.
8 Power Plants Power plants generate electricity from various energy resources. These resources can be classified as: Renewable Solar Wind Water Non Renewable Fossil Fuels Uranium
9 Non Renewable Non renewable resources include fossil fuels such as coal, oil, and natural gas. These nonrenewable resources are forms of chemical energy created from natural occurring elements. Fossil fuels provide around 66% of the world s electrical power and meet 95% of the world s total energy demands. Oil and Coal power plants produce harmful environmental emissions.
10 Non Renewable Nuclear power is also considered a non renewable energy resource. Nuclear power is generated using uranium and produces around 11% of the world s energy needs. The heat required to produce steam, which turns the turbine is created using a process called fission, where atoms split and release energy in the form of heat.
11 Electricity Generation The following image represents a typical fossil fuel power plant.
12 Coal is transported into the plant, where it is burned. The steam turns the blades of the turbine, which is attached to the generator. The heat created causes water from the condenser to form steam. The generator converts the mechanical energy to electrical energy.
13 Renewable Renewable energy resources include water, solar and wind. Hydroelectric power plants take advantage of the downward flow of water to turn the blades of a turbine. Wind works similarly, the wind blows and turns the blades of the turbine. Solar power plants generate electricity by converting the radiant energy from sunlight to electrical using specific materials within the solar panel.
14 Power Systems Must have: Source of energy Process Load Example: Wind Power System Source of energy: the wind Process: spinning generator Load: homes the wind generator is connected to
15 Energy Flow Diagrams The flow of energy within any system can be documented using energy flow diagrams. Energy flow diagrams show what is happening to a particular type of energy as it is used or changed in some process or situation. One type of energy flow diagrams are called Sankey Diagrams.
16 Flow diagram depicting the changes in energy within an automobile. Retrieved from: com/photos/data/522/ HCH2SP_DiagramHybr idcivic.jpg Energy Flow Diagram Example
17 Energy Flow Diagram Example Sankey Diagrams show the type of energy put into a system and the energy conversion, including wasted energy, usually in the form of heat. Retrieved from:
18 Energy Flow Diagram Example Sankey Diagram for US Energy consumption in 2008.
19 Reflection What would an energy flow diagram of a coal power plant look like? Create an energy flow diagram (following either the first example or a Sankey diagram). Display your diagram in the classroom.
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