This calculator is designed to compute for the value of the energy stored in a capacitor given its capacitance value and the voltage across it. The time constant can also be computed if a resistance value is given. Note that the input capacitance must be in microfarads (μF).
The time constant of a resistor-capacitor series combination is defined as the time it takes for the capacitor to deplete 36.8% (for a discharging circuit) of its charge or the time it takes to reach 63.2% (for a charging circuit) of its maximum charge capacity given that it has no initial charge. The time constant also defines the response of the circuit to a step (or constant) voltage input. Consequently, the cutoff frequency of the circuit is defined by the time constant.
V = Applied voltage to the capacitor (volts)
C = Capacitance (farads)
R = Resistance (ohms)
τ = Time constant (seconds)
Let’s consider capacitance C as 1000 microfarad and voltage V as 10 volts.
Let’s apply formula
E= 1000*102 /2
E= 0.0500 joules
Let’s consider capacitance C as 2000 microfarad and reactance R as 10000 ohms.