Show the circuit of step 10 and the results of Table 4-11 in the 3 Thévenin's Theorem section .

Sometimes it is useful to compute a Thévenin equivalent circuit when it is not possible to measure the Thévenin resistance directly. The Thévenin resistance can still be determined for a source by placing a known load resistor on the output terminals and observing the loaded and unloaded output voltage. A simple method is to use a variable resistor as a load resistor and adjust it until the load voltage has dropped to one-half of the open circuit voltage. The
variable load resistor and the internal Thévenin resistance of the source will then be equal. Use this method to demonstrate the measurement of the Thévenin voltage and resistance of the circuit shown in Figure 4-11.