Editing RL circuit (section)

=== Zero-input response ===
The '''zero-input response''' (ZIR), also called the '''natural response''', of an RL circuit describes the behavior of the circuit after it has reached constant voltages and currents and is disconnected from any power source. It is called the zero-input response because it requires no input.

The ZIR of an RL circuit is:

:<math>I(t) = I(0)e^{-\frac{R}{L} t} = I(0)e^{-\frac{t}{\tau}}\,.</math>