Superposition theorem (SPT): In any linear bilateral active network consists of a number of services (more than 1), resistance, etc. the effect produced in any element where all sources act at a time is equal to the sum of the effects produced in the same element due to each source considered individually. [ alt="F6 Shubham 26-10-2020 Swati D11" src="//storage.googleapis.com/tb-img/production/20/10/F6_Shubham_26-10-2020_Swati_D11.png" style="width: 346px; height: 63px;"> For input: K1 x1 ; Output: K2 y1 For input: K2 x2 ; Output: K2 y2 For input: (K1x1 + k2x2); Output: (k1y1 + k2y2 Superposition Theorem obeys: 1) Linearity (ohm’s law) 2) Homogenity 3) Additivity Example: [ alt="F6 Shubham 26-10-2020 Swati D12" src="//storage.googleapis.com/tb-img/production/20/10/F6_Shubham_26-10-2020_Swati_D12.png" style="width: 397px; height: 153px;"> V2 is an AC source. I = ‘I’ due to V1 + ‘I’ due to V2 + ‘I’ due to I1’. NOTE: While applying the superposition theorem, each subcircuit has only one independent source. The remaining sources should be replaced with their internal resistance. Voltage source internal resistance is zero (short) The current source internal resistance is infinity (open) Conclusion: Superposition theorem is applicable for DC and AC sources. Hence statement ‘3’ is false. The remaining all are true.