EE Pro for TI - 89, 92 Plus
Equations - Introduction to Equations
1
Chapter 15
Introduction to Equations
The Equations section of EE
•
Pro contains over 700 equations organized into 16 topic and 105 sub-topic menus.
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The user can select several equation sets from a particular sub-topic, display all the variables used in the set of
equations, enter the values for the known variables and solve for the unknown variables.
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The equations in each sub-topic can be solved individually, collectively or as a sub-set.
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A unit management feature allows easy entry and display of results.
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Variables in selected equation sets can be graphed to examine the relationship between each other.
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Multiple and partial solutions are possible using techniques developed for EE
•
Pro.
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More information on a particular input can be displayed by highlighting the variable, press
‡
and
©
/Type:
to show a brief description of a variable and its entry parameters.
15.1 Solving a Set of Equations
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Equations are accessed from the main level of the EE
•
Pro by pressing function key
…
labeled "Equations."
This displays a pull-down menu listing all the topics as shown in the screen display below.
•
An arrow to the left of the bottom topic ‘
ï
‘indicates more items are listed. Pressing
2
D
jumps to the
bottom of the menu.
•
Scroll the highlight bar to an item using the arrow key
D
and press
¸
, or type the subject number
appearing next to subject heading (Resistive Circuits is selected for this example).
•
A second menu will appear listing more subjects (sub-topics) under the topic heading.
•
Selecting a sub-topic displays a list of equations under the subject heading (Ohm’s Law and Power is selected
below).
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Use the arrow key
D
to move the highlighter and press
¸
to select an equation or series of equations
which are applicable to a specific problem (pressing
„
selects all of the equations).
•
Press
„
to display all of the variables in the selected equations. As the cursor bar is moved, a brief
description of each variable will appear in the status line at the bottom of the screen.
•
Enter values for the known parameters, selecting appropriate units for each value using the toolbar menu
which appear at the top of the screen.
•
Press
„
to compute values for the unknown parameters.
•
Entered and calculated values are distinguished in the display; ‘
é
‘ for entered values and ‘
‘ for computed
results.