User`s guide
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.
• 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.
• The equations in each sub-topic can be solved individually, collectively or as a sub-set.
• A unit management feature allows easy entry and display of results.
• Variables in selected equation sets can be graphed to examine the relationship between each other.
• Multiple and partial solutions are possible using techniques developed for EE•Pro.
• 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
• 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).
• 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.