# 16.7: Time Constant Equations

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## Value of time constant in series RC and RL circuits

Time constant in seconds = RC

Time constant in seconds = L/R

## Calculating time at specified voltage or current

This page titled 16.7: Time Constant Equations is shared under a GNU Free Documentation License 1.3 license and was authored, remixed, and/or curated by Tony R. Kuphaldt (All About Circuits) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.
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