When to use this calculator
Find the characteristic cutoff frequency of a simple RL filter. Ideal first-order RL network with the specified total resistance.
Explore the ac power & reactance calculators for other questions in this topic. For a related calculation, use the RMS Sine Voltage Calculator: Convert peak amplitude of a pure sine wave to RMS voltage.
PUTTING IT INTO PRACTICE
RL Filter Cutoff: 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 |
|---|---|
| Resistance (Ω) | 10 |
| Inductance (mH) | 100 |
| Result | 15.915494 Hz |
- Check the input labels and enter the example values above.
- Apply the relationship: Cutoff frequency = resistance/(2π × inductance in henries).
- The result is 15.915494 Hz, rounded for display.
How to interpret your result
Ideal first-order RL network with the specified total resistance.
Use RMS values in the AC power relationships. Apparent power is measured in VA and real power in watts. Pure-sine conversions and balanced three-phase equations only apply under their stated assumptions.
Frequently asked questions
Why can volt-amps differ from watts?
Apparent power is the RMS voltage-current product, while real power also reflects power factor. They are numerically equal only at a power factor of one.
When is the rl filter cutoff calculator useful?
Find the characteristic cutoff frequency of a simple RL filter. Ideal first-order RL network with the specified total resistance.
How do I use the rl filter cutoff calculator?
Enter resistance (ω), inductance (mh). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Cutoff frequency = resistance/(2π × inductance in henries).
What should I check before using the result?
Ideal first-order RL network with the specified total resistance.
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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