Enter the voltage (volts), the resistance (ohms), time (seconds), and the capacitance (Farads) into the calculator to determine the Capacitor Charge Current.
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Capacitor Charge Current Formula
The following formula is used to calculate the Capacitor Charge Current.
I = V / R * e ^{- (t/(RC))}
- Where I is the Capacitor Charge Current (amps)
- V is the voltage (volts)
- R is the resistance (ohms)
- C is the capacitance (Farads)
- t is the time (charge)
To calculate the capacitor charge current, divide the voltage by the resistance, then multiply by e to the power of the time over the resistance times capacitance.
How to Calculate Capacitor Charge Current?
The following example problems outline how to calculate Capacitor Charge Current.
Example Problem #1
- First, determine the voltage (volts). In this example, the voltage (volts) is determined to be 15 .
- Next, determine the resistance (ohms). For this problem, the resistance (ohms) is measured to be 10 .
- Next, determine the capacitance (Farads). In this case, the capacitance (Farads) is found to be 6.
- Next, determine the time. For this problem, the time is 5 seconds.
- Finally, calculate the Capacitor Charge Current using the formula above:
I = V / R * e ^ 1 – (t/(RC))
Inserting the values from above and solving yields:
I = 15 / 10 * e ^- (5/(10*6)) = 1.380 (amps)
Example Problem #2
Using the same method as above, determine the variables required by the formula. For this example problem, these are:
voltage (volts) = 20
resistance (ohms) = 15
capacitance (Farads) = 4
time (seconds) = 2
Enter these given values into the calculator or above yields:
I = 20 / 15 * e ^ – (2/(15*4)) = 1.289 (amps)