This simple and easy to use PowerPoint resource provides a useful visual stimulus for discussions on energy efficiency and how the loss of energy can be detrimental to the environment. After discussing dissipation of heat energy, I then introduce the practical investigation. Students are provided with two different light bulbs, a ruler, white piece of paper and a thermometer. Students test to see who of the light bulbs causes the greatest increase in temperature in the thermometer. This light bulb gives out the most heat energy and is therefore the least efficient. This result guides students through planning, recording, analysing and evaluating their experiments.
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