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Energy and its Transfer
D. Crowley, 2008
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Energy Transfer To understand energy transfer, and to be able to show this in a diagram
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Different Types of Energy
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Energy What types of energy are there?
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! Thermal (heat) energy - transferred from hot objects to colder ones 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…
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Created & Destroyed Energy is the ability to ‘do some work’ - everything that happens needs energy However, energy cannot be created or destroyed, only transferred from place to place in a variety of ways
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Energy Complete the energy types worksheet
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Energy Transfer Station Initial Energy Useful Energy Transfer I
Useful Energy Transfer II Non-useful Energy Transfer(s) Radio Electrical Sound None Heat / Light Handheld windmill Hair dryer Kettle Solar powered windmill Bunsen burner Plant Signal generator & speaker Clockwork toy
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Energy Transfer Station Initial Energy Useful Energy Transfer I
Useful Energy Transfer II Non-useful Energy Transfer(s) Radio Electrical Sound None Heat / Light Handheld windmill Chemical / Kinetic Kinetic Hair dryer Heat Kinetic (particles blown out) Kettle Solar powered windmill Light Kinetic / Sound / Heat Bunsen burner Chemical Light / Sound Plant Signal generator & speaker Kinetic (speaker movement) / Heat Clockwork toy Elastic potential Sound (useful if part of toy) Sound / Heat (int. movement)
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Energy Complete the energy changes worksheet
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Energy
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Energy
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Waste When energy is transferred from one type to another there is often ‘wasted’ energy This ‘wasted’ energy is in a form which you do not want E.g. what is the wasted energy in a circuit which lights a bulb? In a circuit chemical energy (within the battery) is transferred to electrical energy which runs through the circuit to light energy in the bulb However, heat from the current in the wires / when the bulb is on is our ‘wasted’ energy
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Energy Transfer Your task is to go to each of the stations and record the initial energy (where the energy comes from); what useful energy transfer(s) the device gives; and what non-useful energy transfer(s) there is
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