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
__________ energy
__________ energy
__________ energy
____________energy
__________ energy
__________ energy
__________ energy
Energy
•
What types of energy are there?
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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
None
Sound
Hair dryer
Electrical
Heat
Kinetic (particles
blown out)
Sound
Kettle
Electrical
Heat
None
Sound
Solar powered
windmill
Light
Electrical
None
Kinetic / Sound /
Heat
Bunsen burner
Chemical
Heat
None
Light / Sound
Plant
Light
Chemical
None
None
Signal generator &
speaker
Electrical
Light
Sound
Kinetic (speaker
movement) / Heat
Clockwork toy
Elastic potential
Kinetic
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