The response of the *RL* circuit, shown in figure 2.2, is
similar to that of the *RC* circuit.
There are however some significant differences.

If a battery is inserted into the circuit the current raises quickly from zero to some finite value. The EMF generated in the inductor impedes the current flow until it is constant.

The expression for the current in the *RL* circuit is

where the time constant is now

The voltage across the resistor is an increasing exponential unlike
the *RC* circuit in which the voltage across the resistor decreased
exponentially.
Likewise, the voltage across the inductor decreases with time while in
the *RC* circuit the voltage across the capacitor increased with time.

There are other initial conditions we could work with in this circuit but these can now be worked out by the student.

Tue Jul 13 16:55:15 EDT 1999