AC & DC Equivalent Circuits:

For DC equivalent circuit, reduce all the AC voltage sources to zero and open all the AC current sources and open all the capacitors. With this reduced circuit shown in the figure 1 DC current and voltages can be calculated.

Figure 1

For an AC equivalent circuits reduce the DC voltage sources to zero and open current sources and short all the capacitors. This circuit is used to calculate AC currents and voltage as shown in the figure 2.

Figure 2

The whole current in any branch is sum of the DC and AC currents through that branch. The total voltage across any branch is sum of the DC voltage and AC voltage across that branch.

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