1. What is a Coil Inductance Calculator?

Definition: This calculator computes the inductance of a coil based on its physical characteristics and core material properties.

Purpose: It helps engineers, students, and electronics enthusiasts determine the inductance of a coil for circuit design and analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Inductance (henrys)
• \( \mu \) — Permeability of the core material (H/m)
• \( N \) — Number of turns in the coil
• \( A \) — Cross-sectional area of the coil (m²)
• \( l \) — Length of the coil (m)

Explanation: The inductance increases with more turns, larger cross-section, and higher permeability, but decreases with longer coil length.

3. Importance of Inductance Calculation

Details: Accurate inductance calculation is crucial for designing filters, transformers, motors, and other electromagnetic devices.

4. Using the Calculator

Tips: Enter the permeability (default 1.256×10⁻⁶ H/m for air core), number of turns, cross-sectional area, and coil length. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical permeability value for air core coils?
A: The permeability of free space (air) is approximately 1.25663706212×10⁻⁶ H/m.

Q2: How does the number of turns affect inductance?
A: Inductance increases with the square of the number of turns (N²).

Q3: What units should I use for measurements?
A: Use meters for length and area (m²) for consistent results in henrys.

Q4: Can I use this for toroidal coils?
A: This formula is for solenoids. Toroids use a different formula accounting for their circular geometry.

Q5: Why is my calculated inductance so small?
A: Air core inductors typically have small values (microhenrys). For higher inductance, use ferromagnetic cores or more turns.