From text:
Chapter 7: First Order RC/RL Circuits
While you could write the differential equation for each circuit and solve it I suggest that you work to understand how to use the "formula" to describe how these circuits will behave. This involves learning how to predict the behavior of capacitors and inductors under a range of circumstances..
7-91) There is not a PETA issue here --- The circuit shown below is used to non-destructively test the kick reflex of a frog. The student's observations are that the frog kicks a little when the switch is closed but kicks strongly for about 5 s when the switch is opened. Investigation suggests that the frog will kick strongly as long as 10 mA of current is flowing through the muscles. (similar to electrostimulation of muscles in physical therapy)
