Four of the appliances, including the fan heater, are designed to transform electrical energy into heat.

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1 Q1. The pictures show six different household appliances. (a) Four of the appliances, including the fan heater, are designed to transform electrical energy into heat. Name the other three appliances designed to transform electrical energy into heat (3) (b) Complete the following sentence using one of the words from the box. chemical heat kinetic sound Energy that is not usefully transformed by the fan heater is wasted as... energy. Page 1 of 17

2 (c) The table gives information about two different fan heaters. Useful energy transferred each second in joules Wasted energy transferred each second in joules Fan heater L Fan heater M Complete the following sentence by drawing a ring around the line in the box that is correct. Fan heater L is more efficient than has the same efficiency as is less efficient than fan heater M. (Total 5 marks) Q2. 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 12 June and 13 September. total cost = number of kilowatt-hours cost per kilowatt-hour Show clearly how you work out your answer Total cost =... Page 2 of 17

3 (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 12 June and 13 September? (Total 4 marks) Q3. (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 1.5 kw 2 hours COOL 1.1 kw 1½ hours FAST 1.0 kw ¾ hour Page 3 of 17

4 (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 (ii) Why does it cost more to use the washing machine on the HOT cycle than on the COOL or FAST cycle? (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) Q4. (a) The graph shows the temperature inside a flat between 5 pm and 9 pm. The central heating was on at 5 pm. Page 4 of 17

5 (i) What time did the central heating switch off? (ii) Closing the curtains reduces heat loss from the flat. What time do you think the curtains were closed? Give a reason for your answer. (b) Less heat is lost through double-glazed windows than through single-glazed windows. Complete the following sentences by choosing the correct words from the box. Each word may be used once or not at all. conduction conductor convection evaporation insulator radiation Air is a good.... When trapped between two sheets of glass it reduces heat loss by... and... (3) Page 5 of 17

6 (c) The table gives information about three types of house insulation. Type of insulation Cost to install Money save each year on heating bills Payback time Double glazing years Loft insulation years Cavity wall insulation (i) Use the information in the table to calculate the payback time for cavity wall insulation. (ii) Explain why people often install loft insulation before installing double glazing or cavity wall insulation. (Total 9 marks) Q5. The diagrams show what happens to each 100 joules of energy from burning coal on an open fire and in a stove. Page 6 of 17

7 (a) (b) Add the missing figures to the diagrams. Which is more efficient, the open fire or the stove? Give a reason for your answer.... (3)... (Total 4 marks) Q6. (a) The diagram shows the energy transformations produced by a TV. Page 7 of 17

8 (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 =... (ii) 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 175 hours. Page 8 of 17

9 (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 (ii) Electricity costs 12 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 9 of 17

10 Q7. The pictures show three different types of electric heater. (a) The ceramic heater is run on full power for 5 hours. Use the following equation to calculate, in kilowatt-hours, the amount of energy transferred from the mains to the heater. energy transferred = power time Show clearly how you work out your answer Energy transferred =... kilowatt-hours (b) Which heater will be the most expensive to run on its highest heat setting?... Page 10 of 17

11 (c) A heater is needed for a small office. Comparing each type of heater with the other two, give one advantage of using each type of heater in the office. oil-filled panel heater fan heater ceramic heater (3) (Total 6 marks) Q8. The diagram shows what happens to each 100 joules of energy from crude oil when it is used as petrol in a car. The widths of the arrows show exactly how much energy is transferred in each particular way. (a) (b) Complete the diagram by adding the correct energy value alongside each arrow. Calculate how efficient the car engine is at transferring the energy from petrol into useful movement. [Show your working] (3) Page 11 of 17

12 (c) Two students are discussing the diagram. The first says that none of the energy released from the crude oil is really lost. The other says that all of the energy released from the crude oil is really lost. What do you think? Explain your answer as fully as you can (4) (Total 9 marks) Q9. 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 1200 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 15 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) Page 12 of 17

13 (b) Explain what happens to the waste energy. (Total 6 marks) Q10. (a) The diagram shows how much heat is lost each second from different parts of an uninsulated house. (i) Each year, the house costs 760 to heat. How much money is being wasted because of heat lost through the roof? Show clearly how you work out your answer..... (ii) Insulating the loft would cut the heat lost through the roof by 50 %. The loft insulation has a payback time of years. How much did the loft insulation cost to buy?.. Cost of loft insulation =... Page 13 of 17

14 (b) What happens to the wasted energy? (Total 4 marks) Q11. 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 1200 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 15 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) Page 14 of 17

15 (b) Explain what happens to the waste energy. (Total 6 marks) Q12. (a) The diagram shows how much heat is lost each second from different parts of an uninsulated house. (i) Each year, the house costs 760 to heat. How much money is being wasted because of heat lost through the roof? Show clearly how you work out your answer..... (ii) Insulating the loft would cut the heat lost through the roof by 50 %. The loft insulation has a payback time of years. How much did the loft insulation cost to buy?.. Cost of loft insulation =... Page 15 of 17

16 (b) What happens to the wasted energy? (Total 4 marks) Page 16 of 17

17 Page 17 of 17

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