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OHM's law

V = Voltage in Volts          R = Impedance in OHM          I = Current in Amps


WATT's law

P = Power in Watts          V = Voltage in Volts          I = Current in Amps


Time constant (Tau)

T = Time in seconds          R = Impedance in OHM          C = Capacity in Farad

To have the charge or discharge time of a capacitor, it is necessary to calculate 5 Tau. The formula is applied and times are used to have the full charge or discharge time.