22. Principle of superposition

The current at the arbitrary point and the voltage at the arbitrary point become the sum of the calculated values considering the respective power supply exists independently for the linear electric circuit in case of multiple power source exist. Further, when calculating by paying attention to one electricity source, the voltage source except that is treated as short circuit condition (voltage =0), and current source is treated as patulous state (current =0).

Circuit composed by voltage source and current source

Circuit that removed current source

Circuit that removed voltage source

The current in the above-mentioned circuit is obtained by using Principle of superposition like the following formula.