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Science
Physics
Conversion of Energy
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Izzie-Mai
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Cards (10)
What is the conservation of energy principle?
Energy can be transferred, stored, or dissipated but can never be
created
or
destroyed
.
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Why can't we create new energy according to the conservation of energy principle?
Because
energy
can only move between
different
objects
and
forms.
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How does charging a phone illustrate the conservation of energy principle?
Electrical energy from the wall is transferred to the phone's battery.
Chemical energy
in the battery is converted back to
electrical energy
when used.
Electrical energy powers the screen (
light energy
) and speaker (
sound energy
).
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What happens to energy when it is transferred in a phone?
Some energy is ideally transferred usefully, but some is dissipated as
wasted energy
.
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What is the common form of wasted energy when using a phone?
Heat energy
.
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What defines an open system in physics?
An open system allows
energy
and
matter
to move freely between the system and the
environment
.
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In the phone example, what is considered the system and the environment?
The phone is the system, and everything else in the universe is the environment.
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What happens to heat energy when a phone is placed in a sealed jar?
The heat energy
dissipates
to the air inside the jar and stays within the
closed system
.
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How does the overall energy of a closed system behave?
The overall energy of a closed system
doesn't
ever change.
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