HEEEY, what's going on guys and welcome to   AboodyTV👋🏼😄
and today we will be studying, energy transformation.
for things to happen, we need energy.
We need energy to swim, run, walk and even just laying down on the bed reading a book.
WE NEED ENERGY.
Energy can neither be
created or destroyed.
It can only be transformed from one form to another.
This is called the law of conservation, and
it means that,
to be able to use energy, we need to transform it from one form to another.
There are many different forms of energy!
For example, we have, kinetic energy which is movement energy
we also have electrical, heat, light, nuclear and chemical energy.
If we, for example, take a look at a car,
we can see that the car engine transforms chemical energy which is stored in the fuel
and transform it into kinetic energy.
You need to know that, during every
transformation, a small amount of energy
is always transformed into unwanted
forms!
this is called wasted energy.
If we look back at the car again, a huge
amount of the chemical energy that is
stored in the fuel, will be transformed
into wasted energy such as heat and sound
In physics, if you want to show how
energy is stored and converted
you need to draw a diagram.
One of the simplest diagrams is called the Sankey diagram!
If we want to create a Sankey diagram to
show the energy transformation in a car
the energy input is 100%, and in this
example it is chemical energy.
If we, for example, say that 40% of the energy is converted into kinetic energy to move the car
That means, that 60% of the
energy input is transformed into wasted energy such as heat and sound
and always remember, when drawing a Sankey diagram the width of the arrows is always proportional
to the amount of energy involved.
Using this type of diagram will make it very easy for you to calculate the efficiency
which is the percentage of the energy input that is actually being transformed to useful energy.
To calculate the efficiency, you take the amount of energy output that's useful for you
and divide it by the total energy input.
This will give you an answer in decimal form
and if you multiply it by 100 it will give
you the percentage.
WERE YOU PAYING ATTENTION?
Answer these four questions and find out
Question number one: state and explain the law of conservation
Question number two: name six different forms of energy.
Question number three: 
describe energy transformation
and finally, question number four: describe a Sankey diagram and how it can be used
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watching and I hope that you enjoyed
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