PHYS345 Electricity and Electronics

Hint for D7.12

For 0 < t < 3 s (when the switch on the right is still closed), consider a Thevenin generator that can replace the voltage source and the two resistors as a way of determining the time constant for discharge of the capacitor.

For t > 3 s, the capacitor continues its discharge with a different time constant through the single 2 ohm resistor after the second switch is opened.

Hint for P7.6

When the switch is open, the current source and two resistors may be replaced with a Thevenin generator to determine the time constant for energization of the inductor.

When the switch is closed, the inductor deenergizes through the two resistors now effectively in parallel.


"http://www.physics.udel.edu/~watson/phys345/protected/exercises/hints/1013.html"
Last updated Oct. 13, 1998.
Copyright George Watson, Univ. of Delaware, 1998.