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Energy is the ability to cause change or the work needed for it. Learn about forms of energy, energy by mass and volume, and units of energy. Explore how to calculate energy transferred as heat to water and make informed choices about fuel qualities for different purposes.
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What is energy? • Energy is the ability to cause change, or the work required to produce change. • Some forms of Energy: radiant, electrical, chemical, thermal, and nuclear
Energy by Mass & Volume • Energy by mass – how much energy is stored in a given mass. The higher the energy by mass the lighter the fuel will be. • Energy by volume – how much energy is stored in given of volume of fuel. The higher energy by volume the less space needed to store it.
Energy by Mass or Volume? • If you were designing a car in which there was space for a small fuel tank which quality would you want in a fuel? • If you were designing a car in which you needed a light fuel tank which quality would you want in a fuel?
Units of energy • Calories – the unit of energy that equals the amount of heat necessary to raise the temperature of 1 gram of water by 1 degrees celsius. • Nutritionists refer to calories: 1 Food Calorie = 1000 calories (kcal) 1 Kcal = 1000 calories
How can we calculate energy? • If we know the energy transferred to heat water we can calculate energy (in calories).
