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1200_6energytransformations15.pdf
TRANSFORMATIONS
Energy comes in many
forms:
Thermal
Radiant
(Light) Sound
Chemical
Electrical
Mechanical
When energy
is used to make the toy move, it is transformed from one form into another.
Most energy
transformations can be traced back to the sun : the original source of energy for life on earth.
Simple energy
transformation :
Sunlight (radiant
energy) shines on a person's face and changes to thermal energy.
Why this happens
:
As your skin
absorbs energy the molecules move faster which produces heat .
Some energy
transformations take place in complex chains.
Old style steam locomotive
In this old steam engine, steam is used to
move pistons which make the wheels turn.
Radiant
Chemical
Thermal Mechanical
Old style steam locomotive
How it works:
Radiant energy
from the sun is absorbed by plants. Plants produce chemical energy through photosynthesis. The plants die and become fossil fuels (chemical energy). In the locomotive the chemical energy is burned (thermal energy).
The steam created
from the thermal energy turns the wheels (mechanical energy) to make the locomotive move.
Battery powered alarm clock
In this battery-powered alarm clock, the
time to wake up.
Chemical Electrical Mechanical Sound
Solar-powered car
Most cars run by using a battery for
electrical energy and gasoline for chemical energy. A solar powered car runs using only energy from the sun.
Radiant Electrical Mechanical
Hand-cranked generator
A generator is the opposite of a motor:
Motor: put in electricity and motion comes
out.
Generator: put in motion and electricity
comes out. Chemical Mechanical Electrical RadiantThermal
THINK ABOUT IT
Energy cannot be created or
destroyed. It can only be transformed from one form to another.
Identify all the energy transformations
that occur when you operate a hair dryer.
Energy source:
fossil fuels (coal)
Transformations:
Chemical (burning)
- >
Thermal (steam)
- >
Mechanical
(generator) - >
Electrical
- > Thermal and Mechanical (fan inside) and sound!
Transformations
From source to use
Conclusion
As we each move through our day, we
are constantly witnessing and experiencing transformations of energy. ¾
Alarm clock, microwave oven, lights,
car ¾
Even the leaves on plants are quietly
converting solar energy into chemical energy!
Critical Questions:
Y
What energy transformations take place
inside a working battery? Y
How about in your
i - phone? Y
Flash light?
Y
Car engine?
Y
Your body?