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# Energy work and power

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### Energy work and power

1. 1. ENERGY• The capacity to do work• Work meaning making a body or machine move to achieve a purpose• Can be converted from one form to another• SI unit is joule (J)
2. 2. DIFFERENT FORMS OF ENERGY AND ENERGYCONVERSIONS• Light• Thermal• Sound• Electricity• Gravitational Potential• Kinetic
3. 3. KINETIC ENERGY• In all moving objects• Used to do work; wind and waves can be used to turn turbines that convert kinetic energy into electrical energy
4. 4. GRAVITATIONAL POTENTIAL ENERGY• Stored energy• Can be converted to kinetic energy and vice versa• Exists in many forms1. Chemical Potential Energy- In the food we eat2. Elastic Potential Energy- A spring or rubber band possesses this energy when compressed3. Gravitational Energy- When an object is raised to a certain height above the ground, it possesses this energy
5. 5. PRINCIPLE OF CONSERVATION OF ENERGY• Energy can neither be created nor destroyed in any process. It can be converted from one form to another or transferred from one body to another, but the total amount remains constant
6. 6. WORK• When an object moves under the influence of a force• Work done by a constant force on an object is given product of the force and the distance moved by the object in the direction of the force• W= F x S W= work done by a constant force F F= constant force S= distance moved by the object in the direction of the force
7. 7. POWER• The rate of work done or rate of energy conversion• SI unit is watt (W)• One watt is the rate of work done at 1 joule per second