Source Conversion

(i)    A given voltage source with a series resistance can be converted into an equivalent current source with a parallel resistance.
The source voltage, V_s, divided by the source resistance, Rs, gives the value of the equivalent source current:   
Is = V_s/R_s                                 … (1)

The value of Rs is the same for both sources. The directional arrow for the current points from minus to plus. The equivalent current source is the source in parallel with Rs.




(ii)    A current source with a parallel resistance can be converted into voltage source with a series resistance.
The source current, Is, multiplied by the source resistance, Rs, gives the value of the equivalent source voltage:
            V_s = I_sR_s                                    … (2)

Rs remain the same. The polarity of the voltage source is minus to plus in the direction of the current. The equivalent voltage source is the voltage in series with Rs.



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