Figure 4.22 shows a R–C circuit. The capacitance of the circuit has initial charge Q0 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 ...