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# Energy

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1. Energy

2. 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

3. 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.

4. 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?

5. 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

6. How can we calculate energy? • If we know the energy transferred to heat water we can calculate energy (in calories).