Energy Transfer Noadswood Science, 2012.

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Presentation transcript:

Energy Transfer Noadswood Science, 2012

Saturday, April 01, 2017 Energy & Electricity To revise energy transfers and work out current and charge in an electric circuit

Energy What is energy? What types of energy are there?

Energy Energy is the ability to ‘do some work’ - everything that happens needs energy (e.g. heating; cooking; lighting; movement of vehicles; and keeping us alive)! Energy cannot be created or destroyed, only transferred from place to place in a variety of ways

Types Of Energy Electrical energy - a current in a circuit etc… Light energy - from the sun; a light bulb etc… Sound energy - from a loudspeaker; a drum etc… Kinetic (movement) energy - anything which moves! Nuclear energy - transferred during a nuclear reaction Thermal (heat) energy - transferred from hot objects to colder ones Radiant heat (infra red) energy - transferred as electromagnetic radiation by hot objects Gravitational potential energy - possessed by anything with the ability to fall Elastic potential energy - stretched springs; elastic and rubber bands etc… Chemical energy - possessed by food; fuels; batteries etc…

Energy Transfer Different types of energy can be transferred from one type to another Energy transfer diagrams show each type of energy, whether it is stored or not, and the processes taking place as it is transferred

Energy Transfer Different types of energy can be transferred from one type to another Energy transfer diagrams show each type of energy, whether it is stored or not, and the processes taking place as it is transferred

Sankey Diagrams Sankey diagrams show the relative amounts of each type of energy They summarise all the energy transfers taking place in a process – the thicker the line or arrow, the greater the amount of energy involved Sankey diagram of a light bulb

Wasted Energy can be 'wasted' during energy transfers Energy cannot be created or destroyed, only transferred from one form to another Energy that is ‘wasted’ (e.g. heat energy from an electrical lamp) does not disappear – instead it is transferred to the surroundings, spreading out so much that it becomes difficult to do anything useful with

Lamps - Ordinary Ordinary electric lamps contain a thin metal filament that glows when electricity passes through it – however, most of the electrical energy is transferred as heat energy instead of light energy: -

Lamps – Energy Saving Modern energy-saving lamps work in a different way – they transfer a greater proportion of electrical energy as light energy: -

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