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1. I put a kettle containing 1 litre of cold water on the gas stove, and it takes 5 minutes to reach the boiling point. My friend puts on a small electric kettle, containing ½ litre of cold water, and it takes 5 minutes to get up to boiling point. Which gives more heat in 5 minutes?
a. the gas supply; or
b. the electricity supply?
Can you say how many times as much?
2. One calorie heat energy is needed to raise the temperature of the water from 30ºC to 31ºC.How much heat energy is needed to raise the temperature of the water from 30ºC to 35ºC.
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