How to use the rc circuit charging voltage calculator
Find the capacitor voltage at a given time while charging through a resistor. Enter supply voltage, resistance, capacitance, time in the fields above; the capacitor voltage, charged fraction are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “capacitor charging curve”, “RC charge voltage over time”, “how charged is the capacitor”, “calculate rc circuit charging voltage”, “find capacitor voltage”.
Formula
Variables
- V — Supply voltage (V)
- R — Resistance (kΩ)
- C — Capacitance (µF)
- t — Time (s)
Worked example
With supply voltage = 9 V, resistance = 10 kΩ, capacitance = 100 µF, time = 2 s, the calculator gives capacitor voltage ≈ 7.781982 V; charged fraction ≈ 86.46647 %.
Frequently asked questions
What is the rc circuit charging voltage calculator used for?
Find the capacitor voltage at a given time while charging through a resistor. It helps with questions such as “capacitor charging curve”, “RC charge voltage over time”, “how charged is the capacitor”.
What is the formula for the rc circuit charging voltage calculation?
Capacitor voltage (V) = V × (1-exp(-t / (R × 1000 × C × 1e-6))). Charged fraction (%) = [Capacitor voltage] / V × 100. Here V is supply voltage (V), R is resistance (kΩ), C is capacitance (µF), t is time (s).
What inputs do I need for the rc circuit charging voltage calculator?
You need supply voltage in V, resistance in kΩ, capacitance in µF, time in s. 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 circuit charging voltage 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 circuit charging voltage 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.