Figure 4.22 shows a R–C circuit. The capacitance of the circuit has initial charge *Q*_{0} such that it opposes the flow of charging current. Let the switch K be closed at *t* = 0.

**Fig. 4.22** RC series circuit

The circuit equation in time domain is given by

The Laplace transform of Eq. (4.79) is given by

In the above equation, the term *i*(0–) represent the initial current of the circuit such that ...

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