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ENERGY GCSE REV1 - Coggle Diagram
ENERGY GCSE REV1
Energy transfer, conservation and dissipation
Energy can be transferred by heating, waves, electric current, or a force when it moves an object
In a closed system, energy input is equal to the output
Generally, it appears that the energy output is less than the input. However, when energy is input, it not only outputs through the component but is also dissipated to surroundings. For example, an ordinary electric lamp outputs less light energy than the electrical energy input and that is because a bigger proportion of the energy input is output as thermal energy.
In an LED light bulb, more of the electrical energy is output as light and less as heat which increases the efficiency of the appliance
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When an object falls, its Ep decreases but its Ek increases. Kinetic energy is at its most just before the object hits the ground
In many machines, energy is wasted due to friction between different components. To help reduced the wasted energy, lubrication is used.
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Stores
Gravitational potential energy is energy an object stores depending on how far from the ground an object is placed. EG. a diver about to dive has maximum potential energy
Elastic potential energy describes the energy stored in a springy object when you stretch or squash it
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Chemical energy stores include fuels, foods or the chemicals found in batteries.
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Electricity and power
An electrical object is always designed to waste as little energy as possible. The increased efficiency would also decrease cost as less energy would be needed overall
Examples of everyday appliances are heating, lighting, motors like a fan, visual images (TV) and sound (SOUND)
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Electricity, gas and/or oil supply most of the energy in an average person's home