Procedure

 

 

1)  Keep all the resistance close to their maximum respective values.

2)  Close the switch S₁ to "aa" and S₂ to "cc" positions. Observe the load current (I_L) and voltage (V_L) readings. The load resistance

$$R_{L}=\frac{V_L}{I_L}$$

3)  Remove the load by opening the switch S₂ and read the open circuit voltage (or Thevenin equivalent voltage) V_th.

4)  Next, compute the resistance (R_TH) of the network as seen from the load terminals, 

     

    a) Replace the  220 V source by a short by closing S₁ to "bb".

      

     b) Apply 110 V at the output terminals by closing S₂ to "dd". Read the voltmeter (V) and ammeter (I) and get

                                      

$$R_{th}=\frac{V}{I}$$

 

5) Now compute the load current. Applying Thevenin theorem

$$I_{L}=\frac{V_{th}}{R_{th}+R_{L}}$$

6) Compare the above computed load current with its observed value in step (2) and verify the theorem.