RC Time Constant Calculator

Use our RC Time Constant Calculator to quickly determine the time constant τ = R × C of any resistor–capacitor circuit. Enter your resistance and capacitance values, and the tool will instantly compute the time constant as well as the energy stored in the capacitor using the formula J = ½ × C × V². Perfect for timing circuits, filters, charge/discharge analysis, and general electronics design.

RC Time Constant

The RC time constant represents how long a capacitor takes to charge or discharge to about 63% of its final value. It is calculated as: τ = R × C. A larger value means slower charge and discharge behavior, making RC circuits essential in filters, delays, and smoothing applications.

Energy Stored in a Capacitor

The calculator also computes the stored energy in joules. A capacitor holds electrical energy according to: J = ½ × C × V². This value is crucial for power electronics, timing systems, and safety analysis, helping you ensure proper component selection and circuit performance.

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