(a) The table gives information about some ways of reducing the energy consumption in a house.
Which way of reducing energy consumption is most cost effective over a 10-year period?
To obtain full marks you must support your answer with calculations.
(b) Explain why using an energy-efficient light bulb instead of an ordinary light bulb reduces the amount of carbon dioxide emitted into the atmosphere.
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From Q6 P1 AQA June 2007 (Higher)