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Energy Changes Bars
Tool: The Energy Changes Bars
Tool plots colored bars that display the energy put into or
taken out of the freezing
& melting container and the
energy changes within the container. This tool only plots in
Run
mode.
Place
an energy bars tool by first selecting the container
(don't select the heater/cooler)
then clicking on the Energy Bars button, and finally
clicking at the desired position of the bar graph. You can
later reposition the energy bars graph.
In the energy bars tool's
Properties
Box, you can set:
- Refresh time. How often
the tool redraws the energy bars. The default value is
0.2 sec. The shortest refresh time, 0.1
sec, means the energy bars have the same temporal
resolution as the clock.
However, at such a short refresh time, energy readouts
are difficult to read.
- Show energy readouts.
Controls whether energies are displayed as numbers as
well as bars. Default option is to display the
readouts.
- View mode. Determines
the size of the Energy Changes Bars display. You have
three choices,
min mode,
normal mode, and
max
mode.
Normal
mode, displayed below, is the
default. Energy labels and readouts are not visible in
min
mode.
- Scale mode. You have
two choices,
auto
mode or
hand
mode. For descriptions of
these two modes and what you need to consider in making
the choice, see Choosing
Scale Mode on the
graph
tool's help page.
- Maximum value.
Hand
mode only: Sets the maximum
energy value displayed by the bars. In
auto
mode, setting this value has
no effect.
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This figure illustrates the
layout of the Energy Changes Bars tool. The bar
graph displays the enery changes for a container
filled with water undergoing a
phase
change from
solid to liquid form. The bar graph
displays the cumulative energy changes for the
sixty seconds that the cooler
has been turned on.
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The Energy Input to the
container is simply the total heat energy
supplied by the temperature control unit
(i.e., heater/cooler). If the water were being
cooled, the heat energy bar would appear under
Energy Output. The Energy Changes in
System consists of an increases in the
temperature energy of the water;
separation energy associated with
particles moving away from one another; and
phase energy associated with the
phase change from solid to liquid.
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