A Thévenin equivalent can also be determined from measurements made at the pair of determi...

A Thévenin equivalent can also be determined from measurements made at the pair of determinals of interest. Assume the following measurement were made at the terminals a,b in the circuit Fig. 1.

When a 20 Ω resistor is connected to the terminals a,b the voltage vab is measured and found to be 100 V.

When a 50 Ω resistor is connected to the terminals a,b the voltage is measured and found to be 200 V.

Find the Thévenin equivalent of the network with respect to the terminals a,b.

Figure