See the attached file.
In the circuit of attached figure, S1 is an electronically-controlled switch. It closes at time t = 0 seconds and opens again at time t = 50 milliseconds.
(a) Determine the currents I1, I2 and I3:
(i) under steady-state conditions, e.g. after about `5 time constants'.
(ii) at the instant the switch is first closed.
(iii) 5 milliseconds after the switch re-opens.
(b) Determine the time constants for the circuit for when the switch is open and for when it is closed.
(c) Draw to scale and on a common time axis, waveforms of the three currents over a time of 0 to 80 milliseconds.© BrainMass Inc. brainmass.com October 10, 2019, 1:07 am ad1c9bdddf
This posting contains the solution to the given current and time constant problems.