How it works
Use rc time constant with the units stated beside the fields. This form solves for time constant; enter the known quantities in Resistance, Capacitance.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Resistance | 2,250 Ω | Formula symbol: R. Required unit: Ω. Must be greater than zero. |
| Capacitance | 0.0000015 F | Formula symbol: C. Required unit: F. Must be greater than zero. |
Worked example
Show example inputs and results
This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.
- Resistance
- 2,250 Ω
- Capacitance
- 0.0000015 F
Complete example results
- Time constant
- 0.003375 s
Reading the result
The result solves for time constant from the entered quantities. Check the result unit and the formula conditions before using it.
Questions and answers
Can I use the example values for my own calculation?
The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.
When can I use the time constant result?
This model uses positive magnitudes. It is the time constant of an ideal first-order RC circuit, not completion time. One time constant covers about 63.2% of the charging change.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method sources: openstax.org