ClarityHow to use this tool
- Enter voltage, resistance, capacitance, elapsed time.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| Voltage | Numeric value. Unit: V. Zero or positive. | 12 |
| Resistance | Numeric value. Unit: Ω. Must be greater than zero. | 100 |
| Capacitance | Numeric value. Unit: F. Must be greater than zero. | 0.0001 |
| Elapsed time | Numeric value. Unit: s. Zero or positive. | 0.01 |
Result for these sample inputs
7.58544671 V
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
Capacitor voltage = supply × [1 − exp(−time/(RC))].
Using voltage = 12 V, resistance = 100 Ω, capacitance = 0.0001 F, elapsed time = 0.01 s, the result is 7.58544671 V. Change these example inputs to match your task; use the method above to check each step.
What to keep in mind
Capacitor starts uncharged; resistance and capacitance are constant. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.
Methodology maintained by ClarityKit. How these tools are built and checked.