# Current over Time in a Series RL Circuit#

Consider the $$RL$$ circuit shown below.

## Question Text#

How long after switch $$\rm S$$ is thrown does it take the current in the circuit to reach $$1/{{ params.fac }}$$ of its maximum value? Express your answer in terms of the time constant $$\tau_L$$ of the circuit.

### pl-answer-panel#

$$t =$$ $$\tau_L$$.

## Attribution#

Problem is from the OpenStax University Physics Volume 2 textbook, licensed under the CC-BY 4.0 license.