# Energy transfers in appliances - cost and power

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1 Energy transfers in appliances - cost and power 9 minutes 93 marks Page of 37

2 Q. The diagrams in List A show three electrical appliances. Each appliance is designed to transfer electrical energy. Draw one straight line from each appliance in List A to the useful energy output produced by that appliance in List B. Draw only three lines. (Total 3 marks) Q. The diagram shows the energy transformations produced by a TV. (a) Use words from the diagram to complete the following sentence. The TV is designed to transform... energy into light and... energy. Page of 37

3 (b) Which one of the following statements is false? Put a tick ( ) in the box next to the false statement. The energy transformed by the TV makes the surroundings warmer. The energy transformed by the TV becomes spread out. The energy transformed by the TV will be destroyed. () (c) Two different makes of television, A and B, transform energy at the same rate. Television A wastes less energy than television B. Complete the following sentence by drawing a ring around the correct line in the box. Television A has a higher efficiency than the same efficiency as a lower efficiency than television B. () (Total 4 marks) Q3. (a) The diagram shows the energy transformations produced by a TV. Page 3 of 37

4 (i) Use the information in the diagram and the equation in the box to calculate the efficiency of the TV. efficiency = Show clearly how you work out your answer Efficiency =... What eventually happens to the useful energy transferred by the TV? () (b) Electrical appliances left on standby use energy. The bar chart shows the power for the appliances that one family leaves on standby when they go on holiday. The family is on holiday for a total of 75 hours. Page 4 of 37

5 (i) Use the information in the bar chart and the equation in the box to calculate the energy wasted by leaving the compact stereo on standby while the family is on holiday. energy transferred (kilowatt-hour, kwh) = power (kilowatt, kw) time (hour, h) Show clearly how you work out your answer Energy wasted =... kilowatt-hours Electricity costs p per kilowatt-hour. Use the equation in the box to calculate the cost of leaving the compact stereo on standby while the family is on holiday. total cost = number of kilowatt-hours cost per kilowatt-hour Show clearly how you work out your answer.... Cost =... p () (c) A headline from a recent newspaper article is shown below. Explain why leaving appliances on standby damages the environment (Total 8 marks) Page 5 of 37

6 Q4. (a) The picture shows a new washing machine. Complete the following sentence using one of the words in the box. kinetic light sound A washing machine is designed to transform electrical energy into heat and... energy () (b) The instruction booklet for the washing machine contains the following information. Wash cycle Average power during cycle Time taken to run cycle HOT.5 kw hours COOL. kw ½ hours FAST.0 kw ¾ hour (i) Use the following equation to calculate the energy transferred, in kilowatt-hours, to the washing machine during the HOT wash cycle. Show how you work out your answer. energy transferred = power time Energy transferred =... kwh Why does it cost more to use the washing machine on the HOT cycle than on the COOL or FAST cycle? () Page 6 of 37

7 (iii) Before buying a washing machine, a householder researched several makes to find out which washing machine was the most energy efficient. Write down one way that he could have done this research () (Total 5 marks) Q5. The data included in the diagrams gives the power of the electrical appliances. TV 60 W Radiant heater.0 kw Hairdryer 00 W Sandwich toaster. kw Food processor 0.4 kw Table lamp 40 W (a) (i) Which appliance is designed to transform electrical energy to light and sound? () Which two appliances transform energy at the same rate?... and... () Page 7 of 37

8 (b) During one week, the food processor is used for a total of 3 hours. (i) Use the equation in the box to calculate the energy transferred, in kilowatt-hours, by the food processor in 3 hours. energy transferred (kilowatt-hour, kwh) = power (kilowatt, kw) time (hour, h) Show clearly how you work out your answer. Energy transferred =... kwh Electricity costs 5 pence per kilowatt-hour. Use the equation in the box to calculate the cost of using the food processor for 3 hours. total cost = number of kilowatt-hours cost per kilowatt-hour Show clearly how you work out your answer. Cost =... pence Page 8 of 37

9 (c) A homeowner decides to monitor the amount of electrical energy used in his home. He can do this by using an electricity meter or by using a separate electronic device. Electricity meter Records to the nearest kilowatt-hour Electronic device Records to the nearest /00th kilowatt-hour (i) Use one word from the box to complete the following sentence. precise reliable valid The reading given by the electronic device is more... than the reading given by the electricity meter. () Monitoring the electrical energy used in a home may help people to save money by encouraging them to use less electricity. Explain why, apart from saving money, it is important for people to use less electricity. (Total 9 marks) Page 9 of 37

10 Q6. The picture shows a food processor, which is used to grate, shred, liquidise and mix food. The table gives some information about the food processor. Energy input Electrical Useful energy output Kinetic Power rating 00 watts Efficiency 0.8 (a) The food processor is used for a total of 30 minutes a day. Calculate the cost of the energy wasted by the food processor each day. Electricity costs 5 p per kilowatt-hour. Write down the equations you use, and then show clearly how you work out your answer. Cost of waste energy =... p (4) (b) Explain what happens to the waste energy. (Total 6 marks) Page 0 of 37

11 ## (a) (i) Complete the sentence by choosing the correct word from the box. electrons neutrons protons An electric current is a flow of... () What is the name and circuit symbol for the instrument used to measure electric current? Name:... Symbol: (b) When an electric current flows through a wire, the wire will get hot. Two of the following make use of this heating effect. Which two? (c) A 0. kw light bulb is switched on for 3 hours. Use the following equation to calculate, in kwh, how many units of electrical energy are transferred to the bulb during the 3 hours. units = power time... Number of units = kwh... (Total 7 marks) Page of 37

12 Q8. The picture shows a new washing machine. When the door is closed and the machine switched on, an electric motor rotates the drum and washing. (a) Complete the following sentences. (i) An electric motor is designed to transform electrical energy into... energy. () Some of the electrical energy supplied to the motor is wasted as... energy and... energy. () (b) What happens to the energy wasted by the electric motor? () Page of 37

13 (c) The diagram shows the label from the new washing machine. An A rated washing machine is more energy efficient than a C rated washing machine. Explain what being more energy efficient means. Page 3 of 37

14 (d) The graph shows that washing clothes at a lower temperature uses less energy than washing them at a higher temperature. Using less energy will save money. (i) Electricity costs p per kilowatt-hour (kwh). The temperature setting is turned down from 40 C to 30 C. Use the graph and equation in the box to calculate the money saved each wash cycle. total cost = number of kilowatt-hours cost per kilowatt-hour Show clearly how you work out your answer. Money saved =... p Suggest why reducing the amount of energy used by washing machines could reduce the amount of carbon dioxide emitted into the atmosphere. () (Total 8 marks) Page 4 of 37

15 Q9. A householder was out shopping when her electricity meter reading should have been taken. The electricity company estimated the reading and sent the following bill. Unfortunately, the bill was damaged in the post. (a) Use the equation in the box to calculate the cost of the electricity used between June and 3 September. total cost = number of kilowatt-hours x cost per kilowatt-hour Show clearly how you work out your answer. Total cost =... (b) The estimated reading shown on the bill was not very accurate. The correct reading was How many kilowatt-hours of electricity had the householder actually used between June and 3 September? (Total 4 marks) Page 5 of 37

16 Q0. The picture shows a washing machine. When the door is closed and the machine switched on, an electric motor rotates the drum and washing. (a) Complete the following sentences. (i) An electric motor is designed to transform electrical energy into... energy. () Some of the electrical energy supplied to the motor is wasted as... energy and... energy. () (b) What happens to the energy wasted by the electric motor? () Page 6 of 37

17 (c) The graph shows that washing clothes at a lower temperature uses less energy than washing them at a higher temperature. Using less energy will save money. Temperature setting in C (i) Electricity costs 5p per kilowatt-hour (kwh). The temperature setting is turned down from 40 C to 30 C. Use the graph and equation in the box to calculate the money saved each wash cycle. total cost = number of kilowatt-hours x cost per kilowatt-hour Show clearly how you work out your answer. Money saved =... Reducing the amount of energy used by washing machines could reduce the amount of carbon dioxide emitted into the atmosphere. Explain why. (Total 7 marks) Page 7 of 37

18 Q. (a) The diagram shows hot water being poured into a mug. (i) Complete the sentence by choosing the correct words from the box. Each word may be used once or not at all. air mug table water Heat energy is being transferred from the... to the.... () When will this transfer of heat energy stop? () (b) In the box are the names of four types of fuel used to heat homes. coal gas oil wood Which one of these types of fuel is renewable?... () Page 8 of 37

19 (c) The diagram shows where heat energy is lost from a house. (i) Complete the sentences by choosing the correct words from the box. Each word may be used once or not at all. conduction conductor convection electric evaporation insulator The amount of heat energy lost through the windows by... can be reduced by using thick curtains. The curtains trap a layer of air and air is a good.... The curtains will also stop... currents pulling cold air into the room through small gaps in the window. (3) Write down one other way of reducing heat loss from a house..... () (Total 7 marks) Page 9 of 37

20 Q. The graph shows how the energy transferred by a kw electric kettle varies with the time, in hours, that the kettle is switched on. (a) In one week, the kettle is used for a total of.5 hours. Electricity costs 5 p per kilowatt-hour. Use the equation in the box to calculate the cost of using the kettle for the week. total cost = number of kilowatt-hours cost per kilowatt-hour Show clearly how you work out your answer. Cost =... p (b) Draw a new line on the graph to show how the energy transferred by a kw kettle varies with time. () (Total 3 marks) Page 0 of 37

21 Q3. The diagram shows how one type of electric storage heater is constructed. The heater has ceramic bricks inside. The electric elements heat the ceramic bricks during the night. Later, during the daytime, the ceramic bricks transfer the stored energy to the room. (a) (i) Complete the following sentences using words from the box. conduction convection evaporation Energy is transferred through the metal casing by... The warm air rising from the heater transfers energy to the room by... The inside of the metal case is insulated. Which one of the following gives the reason why? Tick ( ) one box. To transfer energy from the ceramic bricks to the room faster To stop energy from the room transferring into the heater To keep the ceramic bricks hot for a longer time () Page of 37

22 (b) In winter, the electricity supply to a.6 kw storage heater is switched on for seven hours each day. (i) Calculate the energy transferred, in kilowatt-hours, from the electricity supply to the heater in seven hours. Use the correct equation from the Physics Equations Sheet. Show clearly how you work out your answer. Energy transferred =... kwh The electricity supply to the heater is always switched on between midnight and 7 am. Between these hours, electricity costs 5 p per kilowatt-hour. Calculate how much it costs to have the heater switched on between midnight and 7 am. Cost =... p () (c) Between 7 am and 8 am, after the electricity supply is switched off, the temperature of the ceramic bricks falls by 5 C. Calculate the energy transferred from the ceramic bricks between 7 am and 8 am. Total mass of ceramic bricks = 0 kg. Specific heat capacity of the ceramic bricks = 750 J/kg C. Use the correct equation from the Physics Equations Sheet. Show clearly how you work out your answer. Energy transferred =... J (Total 8 marks) Page of 37

23 Q4. Electricity is a useful form of energy. (a) Different energy sources can be used to generate electricity. Give one advantage and one disadvantage (other than cost) of using each energy source to generate electricity in the UK. Using wind Advantage... Using wind Disadvantage Using coal Using coal (4) Page 3 of 37

24 (b) List A shows three electrical devices. List B gives the type of useful energy transferred. Draw a straight line from each electrical device in List A to the useful energy it transfers in List B. (Total 6 marks) Q5. There are many forms of energy. Some of these forms of energy can be stored ready to be used when the energy is needed. The chemical energy in fuels is one example of stored energy. (a) Complete the following sentences by adding the missing words. The chemical energy in fuels such as coal came originally from the.... Energy from fuels can be used to.... Page 4 of 37

25 (b) An electric milk float has its batteries charged up overnight. Early in the morning the milkman sets off on his round. Describe the energy transfers which take place in the milk float as the milkman does his rounds (4) (c) Give another example of energy other than fuels which can be classed as stored energy. Give a use of the stored energy. Type of stored energy... Use (Total 8 marks) Page 5 of 37

26 M. 3 lines correct allow mark for each correct line more than line drawn from any appliance and all those lines are incorrect [3] M. (a) electrical sound correct order only (b) the energy transformed by the TV will be destroyed (c) a higher efficiency than [4] M3. (a) (i) 0.6 accept 60 % allow mark for useful energy = 480 answer 0.6 with any unit or 60 gains mark only Page 6 of 37

27 transferred to surroundings accept goes into the air accept heats the surroundings up accept gets spread out accept transferred into heat (only) do not accept wasted / lost unless qualified destroyed negates mark transferred into light / sound negates mark (b) (i).75 allow mark for converting to kw answers of 0.7, 0.55, 0.35, 0.875,.05, 5.5 gains mark answers of 750 or 7.5 gains mark p or 0. or their (b)(i) (c) any two from: (more) electricity needs to be generated (more) electricity is being used (more) power stations needed (more) fossil fuels burnt accept named fossil fuel (more) pollutant gases emitted accept named gas accept harmful for pollutant accept greenhouse gases accept atmospheric pollution accept answer in terms of any form of electricity generation and an associated environmental problem [8] M4. (a) kinetic accept movement Page 7 of 37

28 (b) (i) 3 (kwh) allow mark for selecting the correct information (iii) transfers more energy accept transform or use for transfer accept electricity for energy allow higher (average) power and switched on for more time any one from: use the internet brochures reading adverts visiting shops recommendation from friends / plumbers [5] M5. (a) (i) TV hairdryer and sandwich toaster both required either order but no others (b) (i). allow mark for correct substitution ie provided that no subsequent step is shown 8 accept 0.8 for both marks or their (b)(i) 5 correctly calculated an answer 0.8 scores mark allow mark for correct substitution ie. or their (b)(i) 5 provided that no subsequent step is shown (c) (i) precise accept any correct indication Page 8 of 37

29 any two from: less electricity needs to be generated less fuels needed accept a named fuel used in any type of power station less air / atmospheric pollution accept named pollutant eg CO accept reduces carbon / carbon dioxide emissions accept reduces radioactive waste (non-renewable) energy sources last longer accept running out of fossil fuels / a named fossil fuel slows global warming / greenhouse effect do not accept stops global warming environmentally friendly is insufficient less pollution is insufficient [9] M6. (a).8 (p) these 4 marks can be broken down as follows: mark for correct transformation and substitution into efficiency equation ie useful power PLUS mark for useful power = 960 W / 0.96 kw PLUS mark for waste energy transferred = or waste energy transferred = 0. (kwh) PLUS mark for cost = 0. 5 where a mathematical error has been made full credit should be given for subsequent correct method 4 (b) the waste energy is transferred as heat and sound to the surroundings where it spreads out / is shared by surrounding particles accept air for surroundings [6] Page 9 of 37

30 M7. (a) (i) electrons ammeter do not accept ampmeter must be capital A horizontal lines not required no e.c.f. (b) light bulb hairdryer answers in either order (c) 0.6 accept correct substitution for (0. 3) mark accept 600 watt hours for mark [7] M8. (a) (i) kinetic do not accept movement thermal accept heat for thermal sound do not accept noise for sound both answers required in either order (b) transferred to surroundings / surrounding molecules / atmosphere it escapes is insufficient or becomes dissipated / spread out accept warms the surroundings accept degraded / diluted accept a correct description for surroundings eg to the washing machine do not accept transformed into heat on its own Page 30 of 37

31 (c) a smaller proportion / percentage of the energy supplied is wasted owtte accept a statement such as less energy is wasted for mark do not accept costs less to run ignore references to uses less energy (d) (i).4 (p) accept p if it is clear from the working out this is rounded from.4 p allow mark for correct substitution of correct values ie 0. allow mark for calculating cost at 40 C (3. p) or cost at 30 C (0.8 p) any one from: less electricity needed ignore answers in terms of the washing machine releasing less energy an answer in terms of the washing machine releasing CO negates the mark do not accept less energy is produced fewer power stations needed less fuel is burned accept a correctly named fuel do not accept less fuel is needed [8] M9. (a) 6.50 allow mark for correct substitution ie 0 5 an answer of 650 gains both marks an answer of gains both marks allow mark for 9 5 (b) 9 allow mark for correctly using the reading ie accept for both marks [4] Page 3 of 37

32 M0. (a) (i) kinetic do not accept movement thermal sound accept heat for thermal do not accept noise for sound both answers required in either order (b) transferred to surroundings / surrounding molecules / atmosphere it escapes is insufficient or becomes dissipated / spread out accept warms the surroundings accept degraded / diluted accept a correct description for surroundings eg to the washing machine do not accept transformed into heat on its own (c) (i) 3 (.0 p) allow mark for correct substitution of correct values ie 0. x 5 allow mark for calculating cost at 40 C (6.5p) or cost at 30 C (3.5p) any two from: less electricity needed ignore answers in terms of the washing machine releasing less energy an answer in terms of the washing machine releasing CO negates mark do not accept less energy is produced fewer power stations needed less fuel is burned accept a correctly named fuel do not accept less fuel is needed [7] M. (a) (i) any one from: water to the mug water to the air mug to the air mug to the table both required direction of transfer must be correct Page 3 of 37

33 when temperatures are the same accept a specific example eg when the temperature of the water and mug are the same accept radiant heat transfer will never stop (b) wood (c) (i) conduction insulator convection accept convection if not given as 3 answer rd any one from: do not accept any rebuilding of house double glazing loft insulation accept roof for loft carpets (cavity) wall insulation do not accept closing doors and windows draft excluders foil behind radiators accept blocking chimney paint inside walls white [7] M. (a) 45(p) accept 0.45 for both marks allow mark for correct substitution ie 3 5 do not award any marks if 45 is used in a subsequent calculation to obtain a final answer Page 33 of 37

34 (b) straight line drawn from origin passing through (,) line must reach, but does not need to continue beyond [3] M3. (a) (i) conduction convection correct order only to keep the ceramic bricks hot for a longer time (b) (i) E = P t 8. allow mark for correct substitution ie.6 7 provided that no subsequent step is shown 9 (p) or their (b)(i) 5 correctly calculated accept 0.9 do not accept 0.9 without sign (c) E = m c θ allow mark for correct substitution ie provided that no subsequent step is shown answers 50 kj or.5 MJ gain both marks [8] M4. (a) Using wind (advantage) any one from can be used in remote locations renewable clean accept does not cause pollution to the air / land Page 34 of 37

35 Using wind (disadvantage) any one from does not generate much (electrical) energy many hundreds wind turbines would be needed accept many hundreds wind turbines would be needed or too much land would be needed for wind farms or wind energy is dilute the wind is unreliable accept the wind does not blow all of the time or the wind is not always strong enough noise / visual pollution do not accept just the word pollution Using coal (advantage) any one from can generate electricity all of the time accept reliable electrical / energy supply generates a lot of (electrical) energy Using coal (disadvantage) any one from pollution by carbon dioxide / greenhouse gas accept slow start-up time or production of ash or difficult to transport (coal) or there s not much coal left non renewable pollution by sulphur dioxide acid rain (b) all link lines correct accept one link line correct for one mark [6] M5. (a) Sun Any valid for mark each Page 35 of 37

36 (b) From electric/pe or chemical in battery for mark to ke, light, sound, heat 3 for mark each 4 (c) Gravitational pe OR just pe For any gravity feed OR Elastic pe any valid OR Food For maintaining body/life etc. OR Any descriptive answer e.g. water in a high lake used to produce hydroelectric power for mark each [8] Page 36 of 37

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