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© Boardworks Ltd 2003 KS4 Energy transfers and Efficiency
© Boardworks Ltd 2003 Machines change energy from one form to another DeviceInput energy Output energy Dynamo Solar cell Catapult Bulb kinetic electrical lightelectrical elastickinetic electricallight
© Boardworks Ltd 2003 More… DeviceInput energy Output energy Microphone Loudspeaker Pendulum Motor sound electrical sound gravitational kinetic electricalkinetic
© Boardworks Ltd 2003 DeviceInput energy Output energy Kettle Wind-up car Coal fire Fan electrical heat elastickinetic chemical heat electricalkinetic More…
© Boardworks Ltd 2003 Transferring energy “Energy can neither be created or destroyed, just changed in form.” You need to be able to give examples of devices that perform specific energy changes. You need to be able to describe the energy changes for a given device. You need to remember that whenever energy is changed from one form to another, some energy is always wasted.
© Boardworks Ltd 2003 Wasted energy You need to remember that whenever energy is changed from one form to another, some energy is always ______. In what two forms is energy usually wasted? 1._________ 2._________ Sound Heat wasted If you can hear a device that is not designed to make noise then energy is wasted as sound. If a device gets warm and it is not designed to get warm then energy is wasted as heat.
© Boardworks Ltd 2003 Wasted sound energy Can you name some devices that waste energy as sound? _____________ Hairdryer Washing machine Car engine Computer Microwave Bunsen burner Wind turbine Dish washer
© Boardworks Ltd 2003 Wasted heat energy Can you name some devices that waste energy as heat? _____________ Computer Turbine Motor Transformer Any electrical device Television Radio Car engine
© Boardworks Ltd 2003 What happens to wasted energy? Wasted e_____ spreads out (d_______) into the s_________. This makes the energy harder to r____. Remember energy can not be c______ or d_______. What happens to the wasted energy you get whenever energy is changed from one form to another? This is why it is important to r_____ the amount of wasted energy there is. reated estroyed nergyissipated urroundings e-use educe
© Boardworks Ltd 2003 Television electrical light sound heat What are the main energy transfers for a television (don’t forget the wasted energy)?
© Boardworks Ltd 2003 Car engine chemical kinetic sound heat What are the main energy transfers for a car engine (don’t forget the wasted energy)?
© Boardworks Ltd 2003 Radio electrical sound heat What are the main energy transfers for a radio (don’t forget the wasted energy)?
© Boardworks Ltd 2003 Efficiency Efficiency is a measure of how good a device is at changing energy from one form to another. All devices waste energy, so the efficiency of a device is never 100%. There is a formula that allows you to calculate the efficiency of a device or of a process. Energy efficient light bulbs are more efficient than normal light bulbs because they w____ less energy, and more of the e______ energy that they are supplied with is converted into l___ energy and not h___. aste lectrical ight eat
© Boardworks Ltd 2003 The efficiency formula We can express efficiency mathematically using the equation: Efficiency= Useful energy out Total energy in The efficiency formula is unusual because it has no units. It is a number between 0 and 1 or a percentage. Useful energy measured in Joules (J) Total energy measured in Joules (J)
© Boardworks Ltd 2003 Efficiency for a bulb If you have a filament bulb and it is supplied with 100J of electrical energy which it converts to 45J of light energy. a)How much energy is wasted? b)In what form is the energy wasted? c)What is the efficiency of the bulb? Efficiency= Useful Total = 45J/100J = 0.45 or 45% 55J heat
© Boardworks Ltd 2003 Efficiency for a radio If you have a radio and it is supplied with 300J of electrical energy which it converts to 96J of sound energy. a)How much energy is wasted? b)In what form is the energy wasted? c)What is the efficiency of the radio? Efficiency= Useful Total = 96J/300J = 0.32 or 32% 204J heat
© Boardworks Ltd 2003 Efficiency for a TV If you have a television and it converts 2 000J of electrical energy into useful energy at an efficiency of 65%, a)What useful energy do get from a TV? b)How much useful energy do you get? Efficiency = Useful Total Useful = Efficiency x total = 0.65 x 2 000J = 1 300J Light and sound
© Boardworks Ltd 2003 In which two forms is energy usually wasted? A.Sound and light B.Heat and sound C.Heat and light D.Light and chemical
© Boardworks Ltd 2003 What is the intended energy transfer for a Bunsen burner? A.Sound light B.Heat chemical C.Chemical light D.Chemical heat
© Boardworks Ltd 2003 In what form is energy wasted for all electrical devices? A.Heat B.Electrical C.Sound D.Light
© Boardworks Ltd 2003 If a plant converts 200J of light energy into 140J of chemical energy by photosynthesis, what is the efficiency of the process? A.30J B.30% C.70J D.70%
© Boardworks Ltd 2003 KS4 Energy transfers. © Boardworks Ltd 2003 Transducers change energy from one form to another DeviceInput energy Output energy.
© Boardworks Ltd of 33 KS4 Physics Energy Transfers.
Energy. What is energy? In science, energy is defined as the ability to do work. Work is done when a force makes and object move in the direction of the.
Conservation of Energy Lesson Objectives: All must know that energy an be neither created nor destroyed but it can be changed from one form into another.
Write down the energy transfers in the following: Hydroelectric power station Fan Speakers Wind turbines.
© Boardworks Ltd of 35. © Boardworks Ltd of 35.
© Boardworks Ltd of 35 Many household objects are designed to transfer energy from one form into another useful form. What is a useful energy transfer?
Forms of Energy Energy types Energy transfers Wasted energy Joules.
© Boardworks Ltd of 33 Physics Energy Transfers.
© Boardworks Ltd of 35 Calculating Efficiency 17 November 2015 Objectives Be able to calculate the efficiency of different systems. HSW: AF4: Be.
Energy transfers. What is a useful energy transfer? Many household objects are designed to transfer energy from one form into another useful form. What.
Do now! 1 Energy Types Word Scramble 2 Title – Energy Flow diagrams and the date.
Efficiency To be able to calculate the efficiency of energy transfers Sunday, May 10, 2015.
Lesson 2- Do now! 1 Energy Types Word Scramble 2 Title – Energy Flow diagrams and the date.
Energy splat! Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy Watch this space!
Energy Transfer Sound energy Heat energy Chemical energyLight energy Gravitational potential energy Electrical energyKinetic energy Key wordPronunciationDefinition.
Starter – List the nine forms of energy Conservation of energy.
“ Energy can neither be created nor destroyed. It can only be changed from one form to another.” one “Energy cannot be created or destroyed. It can only.
1 of 10© Boardworks Ltd of 10© Boardworks Ltd 2009 Kinetic energy is the energy an object has because it is moving. What is kinetic energy? The.
Chapter 3 Different Forms of Energy. What is energy? Energy: the ability to do work or effect change.
Some might: Compare efficient and inefficient devices Some might: Compare efficient and inefficient devices ENERGY EFFICIENCY most should : Apply the conservation.
© Boardworks Ltd of 7 Energy Transformations Part 4 – Efficiency.
Energy Transfers CONSERVATION OF ENERGY. ENERGY Energy resources and energy transfer b) Energy transfer describe energy transfers involving the following.
TYPES OF ENERGY J. The energy an object has because it is moving. Vibrating objects are sources for this energy. Forms of energy that are waiting to be.
Energy Exercises 1.a) kinetic b) potential c) gravitational potential, kinetic d) chemical, heat and light e) store 2a) potential b) kinetic c) kinetic.
OCR 21 st Century Science Unit P3a Revision Sustainable energy.
Energy transfers and efficiency. Energy cannot be created or destroyed. It can only be transferred from one form to another or moved. Energy that is 'wasted',
Objectives Recap the different types of energy and energy transformations. Outcomes C: Describe different types of energy. B: Explain energy transformations.
Efficiency Ashfield Direct Learning Verity Payne Ks4 Energy.
P1 Physics Q2) Energy Transfer and Efficiency Nov 2015 exam revision.
We use machines to convert the energy added to it (energy input) to a different form of energy (useful energy output) that we may want to do work (useful.
Bellringer Finish the following sentence: “Energy is the ability to ____.” Write your completed sentence in your science journal. People often use the.
Energy transformation. Law of Conservation of Energy The Law of conservation of energy says that energy is never gained or lost, it just changes form.
© Boardworks Ltd 2003 KS4 Types of Energy. © Boardworks Ltd 2003 A slide contains teacher’s notes wherever this icon is displayed - To access these notes.
LookThinkDiscussAgreeShareWrite ENERGY TYPES TRANSFERS AND EFFICIENCY Decode the Hieroglyph to find the title of todays lesson.
The energy transferred in this picture is……. Learning objectives Describe the energy transfers in a range of devices. Identify where energy is wasted.
© Boardworks Ltd 2003 KS4 Energy - Types of Energy.
© Oxford University Press 2011 IP Energy transfers Energy transfers.
Energy Transfer Diagrams Starter Activity (back of jotters): 1)What are the 10 types of energy? 2)Draw an energy flow diagram for an ipod.
Problem Solving Energy = the ability to do work Work = force (F) x distance (d) Force is measured in newtons (N) When a newton of force is applied for.
M. Rahman P1 TOPIC 6 1) Name the 9 types of energy giving examples. Answer Electricity Light Sound Kinetic Nuclear Thermal Gravitational potential energy.
Electrical Appliances and Power. Learning Objectives To be able to calculate power, and cost of electricity To be able to apply these calculations to.
1 of 26© Boardworks Ltd of 26© Boardworks Ltd 2006 Can you fill in any words in the crossword?
1 of 26© Boardworks Ltd of 26© Boardworks Ltd 2006.
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