Matthew Kerwin
::
Circuits Problems
–
Step Response
20V
5kΩ
5µF
2µF
5mA
5kΩ
v
c
(0
-
) = 20 V
;
i
c
(0
+
) = 4 mA
v
c
(∞) = -25 V
;
i
c
(∞) = 0 mA
τ = 7.143 ms
v
c
(t) = -25 + 45e
-140t
[V] ; t ≥ 0
time for v
c
to reach 0V: 4.198ms
i
c
(t) = 20 + 4e
-140t
[V] ; t ≥ 0
time for i
c
to reach 0A:
never, but 35.714ms is close