1. What is an Inductor Value Calculator?

Definition: This calculator determines the inductance value (L) based on the voltage across an inductor and the rate of change of current through it.

Purpose: It helps electronics engineers and hobbyists design circuits by calculating the required inductance for a given voltage and current change rate.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Inductance (henrys)
• \( V \) — Voltage across the inductor (volts)
• \( \frac{di}{dt} \) — Rate of change of current (amperes/second)

Explanation: The voltage across an inductor is proportional to the rate of change of current through it, with the constant of proportionality being the inductance.

3. Importance of Inductor Value Calculation

Details: Proper inductor selection is crucial for circuit stability, filtering applications, energy storage, and controlling current changes in power electronics.

4. Using the Calculator

Tips: Enter the voltage across the inductor in volts and the current change rate in amperes per second. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the physical meaning of inductance?
A: Inductance measures an inductor's ability to store energy in a magnetic field when current flows through it and oppose changes in current.

Q2: What are typical inductor values?
A: Values range from nanohenries (nH) for high-frequency circuits to henrys (H) for power applications.

Q3: How do I measure di/dt in practice?
A: Use an oscilloscope to measure current change over time or calculate from known circuit parameters.

Q4: Does core material affect inductance?
A: Yes, inductors with ferromagnetic cores have much higher inductance than air-core inductors of the same geometry.

Q5: What if my current change rate isn't constant?
A: This calculation gives the instantaneous inductance value for a given di/dt. For non-constant rates, more complex analysis is needed.