Texas Instruments TI86 User Manual - Page 260
Electrical Circuits, With the TI
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248 Chapter 19: Applications Electrical Circuits 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 interpolateàextrapolate editor, and a regression forecast. ᕡ In two consecutive columns of the list editor, store the current measurements shown below to the list name CURR and the voltage measurements shown below to the list name VOLT. {10,20,40,60,80,100,120,140,160}¶CURR {2,4.2,10,18,32.8,56,73.2,98,136}¶VOLT ᕢ In the next column of the list editor, enter the list name POWER . ᕣ Enter the formula CURR ¹VOLT in the list editor entry line for POWER. Press b to calculate the values for power and store the answers to the list name POWER. ᕤ Select WIND from the GRAPH menu and set the window variable values as shown. xMin=0 xMax=max(POWER) xScl=1000 yMin= 0 yMax=max(CURR) yScl=10 ᕥ From the home screen, select FnOff from the CATALOG and press b to deselect all functions in the equation editor. Select Plot1( from the CATALOG and set up a stat plot with POWER on the x-axis and CURR on the y-axis. xRes=4
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