When to use this calculator
Estimate voltage during ideal first-order RC charging. Assumes zero initial capacitor voltage and an ideal step source through one resistor.
Explore the dc circuits & components calculators for other questions in this topic. For a related calculation, use the Capacitor Discharge Voltage Calculator: Estimate capacitor voltage after an ideal RC discharge interval.
PUTTING IT INTO PRACTICE
Capacitor Charging Voltage: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Source voltage (V) | 10 |
| Resistance (Ω) | 1,000 |
| Capacitance (μF) | 1,000 |
| Time after connection (s) | 0 |
| Result | 0 V |
- Check the input labels and enter the example values above.
- Apply the relationship: Voltage = source × (1−exp(−time/(RC))).
- The result is 0 V, rounded for display.
How to interpret your result
Assumes zero initial capacitor voltage and an ideal step source through one resistor.
Ideal component models omit tolerances, heat and parasitic effects. Distinguish nominal energy from usable energy for batteries. Component ratings and installation requirements need separate manufacturer and design checks.
Frequently asked questions
Can these calculations select a safe installation rating?
No. They explain ideal relationships and do not include every thermal, protective or regulatory requirement.
When is the capacitor charging voltage calculator useful?
Estimate voltage during ideal first-order RC charging. Assumes zero initial capacitor voltage and an ideal step source through one resistor.
How do I use the capacitor charging voltage calculator?
Enter source voltage (v), resistance (ω), capacitance (μf), time after connection (s). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Voltage = source × (1−exp(−time/(RC))).
What should I check before using the result?
Assumes zero initial capacitor voltage and an ideal step source through one resistor.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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