Energy and its Transfer

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Presentation transcript:

Energy and its Transfer D. Crowley, 2008

Energy Transfer To understand energy transfer, and to be able to show this in a diagram

Different Types of Energy

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…

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

Energy Complete the energy types worksheet

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

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)

Energy Complete the energy changes worksheet

Energy

Energy

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

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