To calculate power we first use superposition to find both current and voltage of each linear element and then calculate the sum of the multiplied voltages and currents. In other words, the sum of the powers of each source with the other sources turned off is not the real consumed power. Superposition works for voltage and current but not power. The theorem is applicable to linear networks (time varying or time invariant) consisting of independent sources, linear dependent sources, linear passive elements ( resistors, inductors, capacitors) and linear transformers. It is used in converting any circuit into its Norton equivalent or Thevenin equivalent. The superposition theorem is very important in circuit analysis. The resultant circuit operation is the superposition of the various voltage and current sources. This procedure is followed for each source in turn, then the resultant responses are added to determine the true operation of the circuit. I=0 internal impedance of ideal current source is infinite (open circuit)).
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