Question

What is the formula of DC RL circuits when finding the initial value of current?

Answer 1

The formula used for a DC RL circuit is

$I= I_{0}e^{-t/\tau}$ and can be written as,

$I_{0} = \frac{e^{-t/\tau}}{I}$

where $I_{0}$ is the initial current,

$\tau= \frac{L}{R}$ is the characteristic time constant.