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This tool calculates the product of resistance and capacitance values, known as the RC time constant. This figure — which occurs in the equation describing the charging or discharging of a capacitance through a resistor — represents the time required for the voltage present across the capacitor to reach approximately 63% of its final value after a change in voltage is applied to such a circuit. The total energy stored in a capacitor charged to a specified voltage is also calculated.

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Voltage
Capacitance
Load Resistance

Output

Time Constant
= s
Joules
= J

Formula