 Energy cannot be created or destroyed.
Energy can only be transformed
from one form to another form.
When energy is transformed / transferred, only part of
it may be useful.
Energy which is not transferred / transformed in a
useful way is wasted.
Waste energy is usually lost to
the surroundings which become warmer.
The light bulb is a device that transforms electrical energy
into light
and heat
energies.
The useful
energy is light and the wasted energy is heat.
Energy becomes increasingly more difficult to use for
further energy transformations.
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