A worksheet aimed at lower-ability students. It will get them very excited as it requires them to heat the water using a 12V, 24W old-fashioned car headlight-type bulb into a beaker of 100 ml water. Don’t worry, it does work and it’s safe. You can extend it for higher-ability by calculating efficiency assuming 4200J/kg deg. C and comparing the input energy from the bulb. Obviously, much is converted to light.
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£2.50