2.A series RL circuit with non-zero initial energy is driven by a
unit step voltage source. The circuit current is found to reach
75% of its steady-state value in one time constant. Express the
initial current in the inductor as a percentage of its steady-state
value.
3.A series RL circuit is driven by a unit step voltage source. i
L
is
found to be 50% at t
τ
. Was there any initial current in the
inductor? If so, what is its magnitude and direction?
4.Find the ratio E/Vsuch that i
L
in Fig. 10.12-2 becomes V/R at
t 0.5
τ
, where
τ
L/R.
408
10 SIMPLE RL CIRCUITS ...
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