Procedure

[Fig.1 The circuit diagram of Millman's theorem.]

2)Close the switch S₁ to "aa" and S₂ to "cc" positions and S₃ to "ff" positions. Observe the load current (I_L).

3)Remove the load by opening the switch S₃ and read the open circuit voltage (or Millman's equivalent voltage) V_m.

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

a) Replace the 220 V source by a short by closing S₁ to "bb" and S₂ to "dd".

b) Apply 110 V at the output terminals by closing S₃ to "ee". Read the voltmeter (V) and ammeter (I) and get

$$ R_m=V/I $$

5.   Now compute the load current. Applying Millman's theorem.

$$ I_L=V_m/(R_m+R_L) $$