Conservation of Energy - The law that energy can be transferred, stored or dissipated but never created or destroyed, Efficiency - The ratio of useful output energy transfer to total energy input. It can never exceed 1 (or 100%), due to the conservation of energy., Gravitational Potential Energy - The store of energy that all raised matter has. It is directly proportional to the mass of the object, the distance that it is raised, and the gravitational field strength at that point., Lubrication - The application of a lubricant (such as oil) to reduce the friction that acts between surfaces. This may improve the efficiency of a system., Power-Rating - The maximum rate of energy transfer of an appliance., Power - The rate at which energy is transferred, or the rate at which work is done. It is calculated by dividing the work done by the time taken., Specifict Heat Capacity - The amount of energy needed to increase the temperature of one kilogram of a given substance by one degree Celsius., Thermal Conductivity - A measure of how good a material is at conducting heat. The higher this value is for a given material, the higher the material’s rate of energy transfer via conduction will be., Thermal Insulation - The addition of a material that reduces the amount of heat that is transferred from a system to its surroundings., Useful Energy Transfer - The transfer of energy by a system, to directly serve the purpose of the system., Waste Energy transfered - The transfer of energy by a system to a form that doesn’t directly serve the purpose of the system., Work Done - Work is done on an object when a force causes it to move through a distance. It is equal to the product of the distance travelled and the magnitude of the force in the direction of motion.,

GCSE, Combined Science, Physics, JMc, OCR, Gateway, KS4, Foundation

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