If q = 0 at t = 0, when the switch is closed, it can be
shown that i(t)=(E/R)exp(-t/t) ,
where 
.
The current, in this example, will sketch as follows (note the full change the current
undergoes for 
is 
). At 
,
.
Since 37% of the change in 
remains, 63% has already
occurred.
[ Purpose | RL Circuit | Square Wave | Measure L | Measure C | Observations]