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-- The quantity 'RC' has the physical dimensions of Time.

-- If the capacitor is charging through a resistor, then 'RC' is the time it takes to

charge up to (1 - 1/e) of the voltage it still has to go to become fully-charged.

-- If the capacitor is discharging through a resistor, then 'RC' is the time it takes to

discharge to 1/e of its present voltage.

-- ' e ' is the base of natural logarithms, approximately 2.71828...

-- 'RC' is called the 'time constant' of the resistor/capacitor combination.

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