StopwatchStopwatch Graph HomeGraphHome Energy Transfer Syllabus Title Page Lesson 01 Types of Energy Lesson 02 Energy Efficiency Lesson 03 Conduction and Convection Lesson 04 Radiation and Insulation Lesson 05 Insulating Homes

StopwatchStopwatch Graph HomeGraphHome Teachers Notes The key words are copied as a list at the start of the topic and the definitions are filled in as the topic progresses. Text in Yellow or Green is for book work: notes or questions Text in Blue is for class work: a practical task, thinking or discussion. Text in Copperplate is a hyperlinks to a worksheet, experiment sheet, handout, movie, internet site or other places inside the PowerPoint. Copperplate For the links to work the external documents must keep the same name and be in the same folder as the PowerPoint

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StopwatchStopwatch Graph HomeGraphHome Stopwatch

Stopwatch Graph HomeGraphHome Syllabus Double and Single Award describe energy transfers involving the following forms of energy: thermal (heat), light, electrical, sound, kinetic, chemical, nuclear and potential (elastic and gravitational) understand that energy is conserved recall and use the relationship efficiency = Useful Energy / Total Energy describe a variety of everyday and scientific devices and situations, explaining the fate of the input energy in terms of the above relationship, including their representation by flow diagrams recall that energy transfer may take place by conduction, convection and radiation describe the role of convection in everyday phenomena describe how insulation is used to reduce energy transfers from buildings and the human body

StopwatchStopwatch Graph HomeGraphHome Energy

StopwatchStopwatch Graph HomeGraphHome Energy Transfers14/09/2015 Aim: To define energy To explain the purpose of a transducer and their role in the conservation of energy To identify energy transfers Starter:in rough Write down words / phrases about energy Compare with your neighbour Compare with your table Agree a definition of energy and one of you write it down (can be more than one sentence)

StopwatchStopwatch Graph HomeGraphHome Energy Definition: Energy is required to do anything (work) (e.g. heat up). Energy is always conserved, it is never used up or destroyed it is transferred into another form (e.g. chemical to heat and light). A transducer changes energy from one form to another (e.g. a match). Symbol: E Unit: J (joules) Analogy: Energy is like money. To do anything costs money. Money is not used up but changes hands when you pay for something. Handout Handout Demo Burning Ethanol

StopwatchStopwatch Graph HomeGraphHome Types of energy There are two groups of energy and nine types you need to learn In rough write down what types of energy you can think of in 1 minute (think about the burning ethanol demo)

StopwatchStopwatch Graph HomeGraphHome Types of Energy Electrical energy ACTIVE (KINETIC) ENERGYSTORED (POTENTIAL) ENERGY

StopwatchStopwatch Graph HomeGraphHome Types of Energy _________ _______ (KE) are all types of movement energy. _________ _______ (PE) are all types of stored energy. TypeKE or PE?Example Sources Kinetic (movement) Heat (thermal)KEflame Light Gravitational Chemical Sound Electrical Elastic Nuclear Kids Hate Learning GCSE Energy Names

StopwatchStopwatch Graph HomeGraphHome On your white board write down the type of energy 1. Energy in a toffee 2. Energy in a running girl 3. Energy causing a light bulb to light 4. Energy given off by a stationary boy 5. Energy in music 6. Energy in a spring shot 7. Energy in a diver

StopwatchStopwatch Graph HomeGraphHome Energy Transfers Watch the demo (flour fire breathing) What energy transfers are occurring?

StopwatchStopwatch Graph HomeGraphHome Example Energy Transfers? electricalkinetic electrical sound lightchemical

StopwatchStopwatch Graph HomeGraphHome There can be more than one step More Complicated Examples gravitational potential kinetic electrical Energy can be transferred into more than one type electrical light heatsound

StopwatchStopwatch Graph HomeGraphHome Energy Circus Around the lab are a selection of transducers. For each one identify All the energy transfers (every stage) Underline useful transfers Bracket wasted transfers Write the name and transfers into your books Example (try in your books in pencil) 1. Catapult Girl Catapult Girl Chemicalkinetic (heat) elastic gravitational (heat) (sound) Elastic

StopwatchStopwatch Graph HomeGraphHome Identifying energy transfers

StopwatchStopwatch Graph HomeGraphHome Energy Transfersrecap Aim: To define a energy To explain the purpose of a transducer and their role in the conservation of energy To identify energy transfers Plenary:on whiteboards Write down the two most important things you have learnt this lesson.

StopwatchStopwatch Graph HomeGraphHome Efficiency 14/09/2015 Aim: To create sankey diagrams To calculate efficiency Starter: Watch the Movie (Roller Coaster) Movie (Roller Coaster) Identify the energy transfers How is energy wasted?

StopwatchStopwatch Graph HomeGraphHome Wasted sound energy If you can hear a device that is not designed to make noise then energy is wasted as sound. Examples of devices that waste energy as sound include:

StopwatchStopwatch Graph HomeGraphHome Wasted Heat Energy If a device gets warm and it is not designed to get warm then energy is wasted as heat. Examples of devices that waste energy as heat include:

StopwatchStopwatch Graph HomeGraphHome Which Type of Energy is Wasted?

StopwatchStopwatch Graph HomeGraphHome Wasted Energy Energy is normally wasted as heat and sound Wasted energy dissipates (spreads out) into the surroundings. This dissipated energy is too spread out to do useful work and so cannot be re-used.

StopwatchStopwatch Graph HomeGraphHome Sankey Diagram – A Candle

StopwatchStopwatch Graph HomeGraphHome Sankey Diagram – A Candle Energy in: Every second the candle transfers 100 joules of chemical energy Energy out: 20 joules into light energy and 80 joules into heat energy 100 J electrical energy “Input” energy“Output” energy 80 J heat energy 20 J light energy So each block represents 10J Only the width matters not the length

StopwatchStopwatch Graph HomeGraphHome Sankey Diagram – Running Man

StopwatchStopwatch Graph HomeGraphHome heat energy sound energy kinetic energy 2000 J electrical energy Sankey Diagram - Running Man Energy in: Every second the man transfers 2000 J of chemical energy Energy out: ? of useful kinetic, ? of useful sound, ? of wasted heat So each block represents 200 J

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StopwatchStopwatch Graph HomeGraphHome Questions Draw Sankey diagrams for the following on graph paper. Highlight the useful energy. Leave the right hand side of the graph paper empty. 1. Light Bulb input: Electrical 200J output: Light 30J, Heat ?J 2. Fire input: Chemical 200J output: Heat 150J, Light ?J and Sound 20J 3. Drill input: Electrical 1000J output: Kinetic 300J, Sound 200J, Heat ?J 4. Computer input: Electrical ?J output: Sound 50J, Light 100J, Heat 80J and Kinetic 20J

StopwatchStopwatch Graph HomeGraphHome Questions Make Sankey diagrams for the following on graph paper. Highlight the useful energy. Leave the right hand side of the graph paper empty. 1. Light Bulb input: Electrical 200J output: Light 30J, Heat 170J 2. Fire input: Chemical 200J output: Heat 150J, Light 30J and Sound 20J 3. Drill input: Electrical 1000J output: Kinetic 300J, Sound 200J, Heat 500J 4. Computer input: Electrical 250J output: Sound 50J, Light 100J, Heat 80J and Kinetic 20J

StopwatchStopwatch Graph HomeGraphHome Energy Efficiency Definition: The amount of energy transferred usefully. Can never exceed 1 or 100%. Equation: Efficiency = useful energy out total energy in It has no Units It can be a %

StopwatchStopwatch Graph HomeGraphHome Example A TV Supplies 50J of heat energy, 50J of sound energy, and 100J of light energy. a) What is the useful energy out? b) What is the total energy in? c) Calculate the efficiency of the TV?

StopwatchStopwatch Graph HomeGraphHome Whiteboard Questions

StopwatchStopwatch Graph HomeGraphHome Questions a) What is the useful energy out? b) What is the input energy in? c) Calculate is the efficiency? 1. Light Bulb input: Electrical 200J output: Light 30J, Heat 170J 2. Fire input: Chemical 200J output: Heat 150J, Light 30J and Sound 20J 3. Drill input: Electrical 1000J output: Kinetic 300J, Sound 200J, Heat 500J 4. Computer input: Electrical 250J output: Sound 50J, Light 100J, Heat 80J and Kinetic 20J

StopwatchStopwatch Graph HomeGraphHome Electrical (total in) Heat (wasted) Light (useful) 200 J 170J 30J a)useful energy out=30J b)total energy in =200J c)Efficiency = useful total = =0.15 or 15% 1) Light Bulb

StopwatchStopwatch Graph HomeGraphHome Chemical (total in) Heat (useful) sound (wasted) 200 J 150J 20J a)useful energy out= =180 J b)total energy in =200 J c)Efficiency = useful total = =0.9 or 90% 2) Fire Light (useful) 30J

StopwatchStopwatch Graph HomeGraphHome Electrical (total in) Kinetic (useful) Heat (wasted) 1000 J 300J 500J a)useful energy out=300J b)total energy in =1000J c)Efficiency = useful total = =0.3 or 30% 3) Drill Sound (wasted) 200J

StopwatchStopwatch Graph HomeGraphHome Electrical (total in) Sound (useful) Heat (wasted) 250 J 50J 80J a)useful energy out=170J b)total energy in =250J c)Efficiency = useful total = =0.68 or 68% 4) Computer Light (useful) 100J Kinetic (useful) 20J

StopwatchStopwatch Graph HomeGraphHome Multiple-choice quiz

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StopwatchStopwatch Graph HomeGraphHome Efficiency recap Aim: To create sankey diagrams To calculate efficiency