A fully charged capacitor discharges to 63% of its voltage after one time period. After 5 time periods, a capacitor discharges up to near 0% of all the voltage that it once had. Therefore, it is safe to say that the time it takes for a capacitor to discharge is 5 time constants. To calculate the time constant of a capacitor, the formula is τ=RC.
After 2 time constants, the capacitor discharges 86.3% of the supply voltage. After 3 time constants, the capacitor discharges 94.93% of the supply voltage. After 4 time constants, a capacitor discharges 98.12% of the supply voltage. After 5 time constants, the capacitor discharges 99.3% of the supply voltage.
After one time constant, the capacitor voltage decreases to about 36.8% of its initial value. Discharge Process: After 5 time constants (5 * R * C), the capacitor is considered fully discharged, meaning the voltage has decreased to less than 1% of its initial value.
Find the time to discharge a 470 µF capacitor from 240 Volt to 60 Volt with 33 kΩ discharge resistor. Using these values in the above two calculators, the answer is 21.5 seconds. Use this calculator to find the required resistance when the discharge time and capacitance is specified
A Capacitor Discharge Calculator helps you determine how long it will take for a capacitor to discharge to a specific voltage in an RC (resistor-capacitor) circuit. Capacitors store electrical energy, but when disconnected from a power source, they discharge gradually over time, releasing their stored energy through a resistor.
Discharge Process: After 5 time constants (5 * R * C), the capacitor is considered fully discharged, meaning the voltage has decreased to less than 1% of its initial value. The table below provides a general understanding of how capacitor discharge works relative to the number of time constants that have passed.
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