apply the principle of homogeneity there) and (iv) take the imaginary part. We skip all that
basic algebra and give the result below:
(10.9-11)
By substituting
θ
90°, we get the solution for v
S
(t) cos
ω
tu(t) as
(10.9-12)
Equation 10.9-11 indicates that it is possible to switch on an AC voltage to an initially
relaxed series RLcircuit in such a way that there is no transient response and the circuit
immediately goes to a steady-state – the switching instant must be such that
θ
φ
. This
principle is used sometimes in switching of heavily inductive power equipment. ...
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