* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 4.1 Forms of Energy
Dark energy wikipedia , lookup
Efficient energy use wikipedia , lookup
Potential energy wikipedia , lookup
William Flynn Martin wikipedia , lookup
Open energy system models wikipedia , lookup
Energy subsidies wikipedia , lookup
Energy storage wikipedia , lookup
100% renewable energy wikipedia , lookup
Kinetic energy wikipedia , lookup
Low-Income Home Energy Assistance Program wikipedia , lookup
Public schemes for energy efficient refurbishment wikipedia , lookup
Zero-energy building wikipedia , lookup
Regenerative brake wikipedia , lookup
Low-carbon economy wikipedia , lookup
World energy consumption wikipedia , lookup
Energy Charter Treaty wikipedia , lookup
Energy policy of Australia wikipedia , lookup
Alternative energy wikipedia , lookup
International Energy Agency wikipedia , lookup
Distributed generation wikipedia , lookup
Internal energy wikipedia , lookup
Energy policy of the United Kingdom wikipedia , lookup
Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup
Energy returned on energy invested wikipedia , lookup
Energy harvesting wikipedia , lookup
Energy efficiency in transport wikipedia , lookup
Energy policy of Finland wikipedia , lookup
Energy in the United Kingdom wikipedia , lookup
Conservation of energy wikipedia , lookup
Negawatt power wikipedia , lookup
Energy policy of the European Union wikipedia , lookup
United States energy law wikipedia , lookup
Energy efficiency in British housing wikipedia , lookup
Energy Independence and Security Act of 2007 wikipedia , lookup
4.1 Forms of Energy What is energy? Energy is the ability to do work. We define work in a few days Energy makes everything happen and can be divided into two main types: Stored energy is called potential energy. Moving energy is called kinetic energy. Try explaining these concepts with your pencil. Different Forms of Energy Form of Energy Description Example Kinetic Energy (KE) Energy of an object due to its motion Vehicle in motion Gravitational Potential Energy (GPE) Energy of an object due to its position Book lifted up gains GPE, a crane raises a cargo container Chemical Energy Energy stored in a substance Battery, wood, oil and released when chemical reactions take place Electrical Energy Energy transferred by an electric current Electricity running through wires Elastic Strain Energy Energy stored in an elastic object when we stretch or squash it Stretched Spring, rubber band Different Forms of Energy Note: the energy of an object due to its temperature is sometimes called thermal energy Form of Energy Description Example Nuclear Energy Energy released when the nucleus of an atom splits or disintegrates A uranium fuel rod in a nuclear reactor Internal Energy Energy of an object due to the internal motion and positions of its molecules Magnetized object or a hot object Heat Energy Energy transfer from a hot object to a cold object heat radiation from burning coals Sound Energy Energy transfer by sound waves Sound from a drum Light Energy Energy transfer by light Light from a flashlight Energy Transformations Energy Transformations: when energy changes from one form into another. Energy Transfer Example An athlete performing a pole-vault: 1. Uses his or her muscles to convert chemical energy into kinetic energy and elastic strain energy of the pole. 2. This is then transformed into GPE and also produces heat energy and sound energy Chemical Energy Kinetic Energy + Elastic energy GPE + thermal energy + sound energy Energy Transfer Example A pile driver on a building site: Lifts a heavy steel block above the top end of the girder then lets it crash down onto the girder. GPE Kinetic Energy thermal energy + sound energy Summary Questions GPE 1. When a ball falls in the air, it loses __________ energy and gains __________ energy. KE 2. When an electric heater is switched on, it changes electrical thermal +heat __________ energy into __________ energy. 3. List two different objects you could use to light a room in the event of a power outage. For each object, describe the energy changes that happen when it produces light.