English: Voltage curve of a charging capacitor in a series RC circuit. The vertical axis shows the voltage across the capacitor as a percentage of the applied voltage to the RC circuit. τ represents the RC time constant.

Replaces existing PNG image. Created by me using Python and matplotlib. See talk for details.

Note: If you see a checkerboard pattern behind the charts, this is due to a change in the Wikipedia stylesheet to show behind transparent images. I'm hopeful that it will be reverted soon so I'm going to leave them transparent.