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# Law of Conservation of Energy

An introduction of the law of conservation of energy, efficiency, and examples of transformations between energies.
by

## Kerry Tallon

on 16 February 2016

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#### Transcript of Law of Conservation of Energy

The Law of Conservation of Energy
The law states that energy cannot be
created
or
destroyed
. Energy can only change
forms
.
What is the Conservation of Energy?
So what does this mean?
All energy(ies) are measured in joules, and the
total
number of joules of energy in a closed system always remains the same.

This means that regardless of how many transformations energy goes through the total number of joules in the system will not change.
So, how is energy conserved?
Changes in energy or energy transformations can only take place in a
closed system
A closed system is a group of objects that transfer energy only to
each other
.
'Get the ball rolling' example
roll a ball across carpet and watch what happens.
Why doesn't the ball keep rolling?
The kinetic energy of the ball transforms into
thermal
energy in the
rug
and
air
.
So, lets talk about an example.
Other examples of energy transformations are...
Example
When energy is turned into useful energy, but some energy is always transformed into an unintended form.
The most common unintended form is Heat.

Energy EFFICIENCY is a comparison of the amount of energy
before
a conversion with the amount of
useful
energy after a conversion.
Efficiency
Some examples of energy efficiency are cars and the home you live in.
Full transcript