How to use the rc discharge current calculator
Find the starting discharge current of a capacitor through a resistor and its current at a later time. Enter initial voltage, resistance, capacitance, time in the fields above; the starting current, current at time t are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “capacitor discharge current”, “RC current decay”, “discharge current over time”, “calculate rc discharge current”, “find starting current”.
Formula
Variables
- V — Initial voltage (V)
- R — Resistance (kΩ)
- C — Capacitance (µF)
- t — Time (ms)
Worked example
With initial voltage = 9 V, resistance = 1 kΩ, capacitance = 470 µF, time = 500 ms, the calculator gives starting current ≈ 9 mA; current at time t ≈ 3.106183 mA.
Frequently asked questions
What is the rc discharge current calculator used for?
Find the starting discharge current of a capacitor through a resistor and its current at a later time. It helps with questions such as “capacitor discharge current”, “RC current decay”, “discharge current over time”.
What is the formula for the rc discharge current calculation?
Starting current (mA) = V / R. Current at time t (mA) = [Starting current] × exp(-t / (R × C)). Here V is initial voltage (V), R is resistance (kΩ), C is capacitance (µF), t is time (ms).
What inputs do I need for the rc discharge current calculator?
You need initial voltage in V, resistance in kΩ, capacitance in µF, time in ms. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the rc discharge current calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the rc discharge current result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.