Section I: Transients in R-L Circuits
Transients in R-L Circuits
In this section we shall consider transients in a circuit that contains a resistor and inductor (R - L circuit). Consider the circuit shown in Fig. 6.1 that contains an ideal source ( νs ), a resistor ( R ), an inductor ( L ) and a switch ( S ). It is assumed that the switch is open and is closed at an instant of time t = 0. This implies that the current i is zero before the closing of the switch. We shall first discuss the effect of closing the switch on the line current (i ) when the source is dc. Following this we shall study the effect when the source is ac and will show that the shape of the transient current changes with the changes in the phase of the source voltage waveform at the instant of closing the switch.
Fig 6.1 A Simple R - L Circuit
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