1) Power lines lose energy. How does this happen? a) Roosting birds absorb energy b) By being too long c) It escapes into the Earth d) By heating up 2) Some power stations could burn wood from trees that are grow specially for the power station. Why does burning wood not increase carbon dioxide in the atmosphere where burning coal does? a) The carbon dioxide released when wood is burnt was take out of the atmosphere when the tree grew b) The carbon dioxide released when wood is burnt is safer c) Coal releases much more carbon dioxide than wood d) Wood does not release carbon dioxide when burnt 3) What does D.C. stand for? a) Directing current b) Directing charge c) Direct current d) Direct charge 4) How many of the following energy resources are powered by the sun? Wind, Hydroelectric, Passive solar heating. a) zero b) one c) two d) three 5) If burning fossil fuels are so bad, why do we produce most of our electricity this way? a) To use them up before they run out b) Other ways of generating electricity are not safe c) Fossil fuels are free d) Fossil fuels release very large amounts of energy 6) Passive solar heating happens because... a) Hot air gets trapped behind glass b) Hot air rises c) Heat from the Sun warms the room d) Light gets trapped inside 7) Electricity meters measure the units of electricity you use in your home. What is the correct name for a unit of electricity a) KiloWatt-hour b) KillerWatt-hour c) KillerWatt-second d) KiloWatt-second 8) What does A.C. stand for? a) Alternating charge b) Alternative current c) Alternating current d) Alternative charge 9) What is the frequency of a wave? a) The number of waves per second b) The number of times it happens c) How often the current alternates d) The number of waves in one cycle 10) These hair straighteners have a power rating of 1000W. If they are left on for 2 hours how many units of electricity have been used? a) 1 b) 1000 c) 2000 d) 2 11) Solar cells produce... a) A.C. b) D.C. c) Both d) Neither 12) A step up transformer does what? a) Increases the current b) Increases the voltage c) Increases the current and voltage d) Increases the power 13) If a magnet is moved inside a coil of wire a current is induced. Which of these is not a way to increase the current? a) Using a stronger magnet b) Using a longer piece of wire c) Moving the magnet faster d) Using more coils of wire 14) The mains electricity is A.C. What is its frequency? a) 30Hz b) 40Hz c) 50Hz d) 60Hz 15) From the following statements pick one advantage of using solar cells to generate electricity. a) They produce high currents b) They can be used in remote places c) They are cheap to buy d) They produce electricity all the time 16) From the following statements pick one disadvantage of using solar cells to generate electricity. a) They produce free electricity b) They produce low currents c) They do not pollute the environment d) They work all the time 17) The amount of electricity produced by a solar cell depends on which one of these things? a) Light intensity b) Voltage c) Resistance d) Current 18) A 240V hairdryer draws 4A of current from the mains electricity supply. Using the equation above work out the power of the hairdryer. a) 0.02W b) 960W c) 60W d) 1kW 19) 500kJ is given off when coal is burnt in a power station. 100kJ of electrical energy is produced. What is the powerstations efficiency? a) 50000 b) 400 c) 0.25 d) 0.2 20) What is the first main stage to producing electricity in a power station. a) Magnet is turned b) Water is boiled c) Steam turns a turbine d) Fuel is burnt

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