This tool calculates the time it takes to discharge a capacitor (in a Resistor Capacitor network) to a specified voltage level. It’s also called RC discharge time calculator. To calculate the time it takes to discharge a capacitor is to enter: The time constant τ = RC, where R is resistance and C is capacitance.
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
The 3 variables which affect how the inital voltage discharges is time, t, the resistance of the resistor, R, and the capacitance of the capacitor, C. The greater the amount of time has elapsed, the more the capacitor will discharge. The less time that has elapsed, the less time the capacitor has to discharge.
The time constant, RC, is the time it takes for the voltage across the capacitor to charge or discharge 63.2%, which is equal to e-1. The amount of electric charge that has accumulated on the plates of the capacitor can be calculated if the voltage and capacitance are known.
The capacitor is discharged approx. 99.33% after a period of 5 τ. This means that at specified times, well over 5 τ the charging voltage is close to zero.
*In the case of small current discharge, it needs to consider the discharge current of the capacitor (self-discharge). The motion back up, such as RAM and RTC is generally constant current. As an example, charging DB series 5.5V 1F with 5V and discharge until 3V with 1mA of constant current.
Capacitor Charge, Discharge and Time Constant …
Capacitor Charge and Discharge Calculator. The calculator above can be used to calculate the time required to fully charge or discharge the capacitor in an RC circuit. The time it takes to ''fully'' (99%) charge or discharge is equal to 5 times …
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The Capacitor Discharge Calculator calculates the voltage that a capacitor with a a capacitance, of C, and a resistor, R, in series with it, will discharge to after time, t, has elapsed. You can use …
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This tool calculates the time it takes to discharge a capacitor (in a Resistor Capacitor network) to a specified voltage level. It''s also called RC discharge time calculator. To calculate the time it takes to discharge a capacitor is to enter: The time constant τ = …
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Using the Capacitor Discharge Time Calculator is straightforward. Enter the values of the capacitor''s capacitance (C) in farads and the resistor''s resistance (R) in ohms. Click the …
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From Calculation 1, discharge time t={C x (V0-V1)} / I = {1F x (5.0V-3.0VV}/0.001A = 2000 seconds. Therefore it would calculate 33 minutes of backup. As another example – calculating …
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Capacitor Charge and Discharge Calculator. The calculator above can be used to calculate the time required to fully charge or discharge the capacitor in an RC circuit. The time it takes to ''fully'' (99%) charge or discharge is equal to 5 times the RC time constant:
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Using the Capacitor Discharge Time Calculator is straightforward. Enter the values of the capacitor''s capacitance (C) in farads and the resistor''s resistance (R) in ohms. Click the "Calculate" button to obtain the discharge time (t) in seconds. This tool provides a quick and efficient way to obtain accurate discharge time results.
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From Calculation 1, discharge time t={C x (V0-V1)} / I = {1F x (5.0V-3.0VV}/0.001A = 2000 seconds. Therefore it would calculate 33 minutes of backup. As another example – calculating the necessary capacitance for 1-hour back up with RTC, which works with 2.0V to 1.0V of motion voltage range and 10μA of used current.
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