1. Law of Conservation Efficiency
ENERGY
Law of Conservation
Efficiency

2. Law of Conservation of Energy
Energy can be neither created nor destroyed; it can only be transferred or transformed
Transferred – from 1 place to another
Ex: Light switch to light bulb
Transformed – from 1 type to another
Ex: Electrical to thermal (toaster)

3. Energy Efficiency
Proportion of energy consumed in a device/system that is transformed into effective work
Amount of useful energy
= x 100
Amount of energy consumed
Example:
Calculate the energy efficiency of a cell phone that requires J per second but only requires 850 J to light up and make sound. What happened to the “unused” energy?

4. Improve Energy Efficiency
Isolate system as not to loose heat (house)
Decrease friction with lubricant (motor oil)
Ensure all parts of system are moving how they are supposed to