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The Law of Conservation of Energy states that energy cannot
be created or destroyed.
If you read the rules to the right you will see that it has been 'modified'
due to recent discoveries (see Einstein's famous equation).
Rule 1
Law of Conservation
of Energy:
Energy cannot be
created or
destroyed, only
change forms
Rule 2
Law of Conservation
of Matter:
Matter cannot be
created or
destroyed, only
change forms
Finally, a 'new' law!
The Law of
Conservation of
matter and energy
The total amount of
matter and energy in
the universe is fixed.
Rule 3
E = m x c2

Matter and energy
can be converted
back and forth
Conversion of energy:
Energy is changed from one form to another.  
Every change that happens is due to conversions of energy.  

Always keep in mind the Law of Conservation of energy when
you are looking at energy conversions so when energy
'disappears' you remember to look for where it has gone.
From    To>
v        
Heat
Light
Sound
Chemical
Mechanical
Electrical
Heat
 
Fire
Thunder
Endothermic
Chemical Reactions
Heat Engins
Thermocouples
Light
Black
Paper
 
??
Photosynthesis
Radiometer
Solar Cells
Sound
??
??
 
??
??
Microphones
Chemcial
Explosions
Light
Wands
Explosions
(boom!)
 
Explosions!
Battery
Mechanical
Friction
??
Clapping
Hands
??
 
Generator
Electrical
Heater
Light Bulb
Speakers
Rechargable Battery
Electric Motor
 
Energy Conversions
Changing from one form of Energy to Another
The Flow of Energy
In the example below trace the flow of energy.  Remember that some energy is lost in each conversion