Transcript energy - Doral Academy Preparatory

WHAT IS ENERGY?
• THE ABILITY TO DO WORK OR
CAUSE CHANGE IS CALLED
ENERGY
There are two basic kinds of
energy…
• KINETIC ENERGY- The energy an object has
due to its motion.
• POTENTIAL ENERGY-Stored energy That
results from the position or shape of an object.
• For example, a car parked in a driveway has
potential energy. When the ignition is started and
it drives away, the car gains kinetic energy as it
moves.
ENERGY TRANSFORMATION
• Transfer of energy is called energy
transformation
• Most forms of energy can be transformed
into other forms.
• Some energy changes involve one
transformation while others involve many
transformations.
• Single
Transformations
• Multiple
Transformations
• A toaster transforms electrical
energy to thermal energy to
toast your bread.
• The mechanical energy used
to strike a match is
transformed first to thermal
energy. The thermal energy
causes the particles in the
match to release stored
chemical energy, which is
transformed to thermal energy
and electromagnetic energy
you see as light.
• A cell phone transforms
electrical energy to
electromagnetic energy that
travels to other phones.
• Your body transforms the
chemical energy in your food
to mechanical energy you
need to move your muscles.
CONSERVATION OF ENERGY
• The law of conservation of
energy states that energy
cannot be destroyed or
created.
RENEWABLE ENERGY
• Used to describe energy sources that are
replenished by natural processes on a
sufficiently rapid time-scale so that they
can be used by humans more or less
indefinitely, provided the quantity taken per
unit of time is not too great.
• Energy that can be replenished at the
same rate as it is used
Renewable energy sources
•
•
•
•
Wind power
Hydropower
Solar energy
Geothermal
NON RENEWABLE ENERGY
• A non-renewable resource is a natural resource which
cannot be produced, re-grown, regenerated, or reused
on a scale which can sustain its consumption rate.
These resources often exist in a fixed amount, or are
consumed much faster than nature can recreate them.
• Energy that cannot be replaced once it is used or energy
that is not being replaced as fast as it is being used
• Used to describe energy sources that exist in a limited
amount on Earth. Thus all available material could
eventually be completely used up
Non-Renewable energy sources
•
•
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Fossil fuels:
coal
petroleum
natural gas
• Nuclear power:
• Uranium