Texas TI-86 用户手册

19APPS.DOC   TI-86, Chap 19, US English   Bob Fedorisko   Revised: 02/13/01 2:41 PM   Printed: 02/13/01 3:05 PM   Page 248 of 18

19APPS.DOC   TI-86, Chap 19, US English   Bob Fedorisko   Revised: 02/13/01 2:41 PM   Printed: 02/13/01 3:05 PM   Page 248 of 18

A measurement device has measured the DC current (C) in milliamperes and voltage (V) in
volts on an unknown circuit. From these measurements, you can calculate power (P) in
milliwatts using the equation 

CV=P

. What is the average of the measured power?

With the TI

-86, you can estimate the power in milliwatts at a current of 125 milliamperes

using the trace cursor, the interpolate

àextrapolate editor, and a regression forecast.

�   In two consecutive columns of the list editor, store the current

measurements shown below to the list name 

 and the

voltage measurements shown below to the list name 

.

�   In the next column of the list editor, enter the list name 

 .

�   Enter the formula 

 in the list editor entry line for

. Press b to calculate the values for power and store

the answers to the list name 

.

�   Select 

 from the 

GRAPH

 menu and set the window variable values as shown.

�   From the home screen, select 

 from the 

CATALOG

 and

press b to deselect all functions in the equation editor.
Select 

 from the 

CATALOG

 and set up a stat plot with

 on the x-axis and 

 on the y-axis.