WEBVTT

NOTE Neural narration; phrase times estimated within exact synthesized scene segments.

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A charging circuit. Connect a capacitor to a constant-voltage source through

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a resistor. Its voltage rises quickly at first, then more slowly.

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Meet the time constant. Resistance times capacitance gives the time constant.

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10000 ohms times 100 microfarads is one second.

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One time constant. After one time constant, an ideal charging capacitor

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reaches about 63 percent of its final voltage.

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Almost there. After five time constants it reaches about 99.3 percent.

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The ideal exponential approaches its final value gradually.