Measure the load voltage to verify your calculation. Enter the computed and measured load voltage in Table $12-2.$

Table $12-2$

$\backslash$table$[[,$Computed,Measured$],[V_{L1},,],[V_{L2},,],[V_{L3},,],[V_{TH},,],[R_{TH},,]]$

PROCEDURE Measure and record the resistance of the $6$ revistors a time, to the output terminals.

$\backslash$table$[[$Table $12-1],[\backslash$table$[[$Component$,\backslash$table$[[$Listed$],[$Value$]],\backslash$table$[[$Messured$],[$Value$]]],[R_1,270,],[R_2,560,],[R_3,680,],[R_{L1},150,],[R_{L2},470,],[R_{L3},820,]],]]$

Figure $12-3$

$2.$ Construct the circuit shown in Figure $12-3.$ Points A and $B$ represent the output terminals. Calculate an equivalent circuit seen by the volage source. Figure $12-4$ illustrates the procedure. Use the equivalent circuit to compute the expected voltage across the load resistor, $V_{L1}.$ Do not use Thevenin's theorem at this time. Show your computed load voltage in the space provided. For the first load resistor, $R_{Ll},$ your computed voltage should be approximately $1\mathrm{.}43$ V $.$

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resistors. Since the circuit is a ser Table $12-3.$

Enter the computed voltages in Table $12-3.$

$\backslash$table$[[,$Computed,Measured$],[,,],[V_{L1},,],[V_{LL},,],[V_{L3},,],[V_{TH},,],[R_{TH},,]]$

Construct the Thevenin circuit you drew in step $8.$ Use a $1k$ potentiometer to represent the Thevenin resistance. Set it for the resistance shown on your drawing. Set the voltage source for the Thevenin voltage. Place each load resistor, one at a time, on the Thevenin circuit and measure the load voltage. Enter the measured voltages in Table $12-3.$

Remove the load resistor from the Thevenin circuit. Find the open circuit voltage with no load. Enter this voltage as the computed and measured $V_{TH}$ in Table $12-3.$ Enter the measured setting of the potentiometer as $R_{TH}$ in Table $12-3.$