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RC time constant. Electronic capacitors charge quickly at first but slow...

RC time constant illustrated. When charging a capacitor (C) through a resistor (R) it gains about 63% of the applied voltage quickly, and then takes that amount of time to charge to 86.5% and on it goes. The time per time constant depends on the resistor and capacitor value.

Demonstration and explanation of the RC time constant using a light bulb. Video by James Dann.

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555 Timer Circuits - Flashing LED - RC Time Constant

PHY 132 Lab 5 Oscilloscope. RC Time Constant