Fig. 4.21 shows an initially relaxed R–L circuit in which step response is considered.

**Fig. 4.21** R–L series circuit

The circuit equation is given by

Taking Laplace transform of Eq. (4.75), it can be written as follows,

Since circuit is initially relaxed i.e., de-energized hence *i* (0–) = 0

Taking inverse Laplace transform of Eq. (4.77), it can be written as follows,

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