1. What is Coil Inductance?

Inductance is the property of an electrical conductor that opposes a change in current. In a coil, it depends on the number of turns, the coil geometry, and the core material's permeability.

2. How Does the Calculator Work?

The calculator uses the inductance formula:

Where:

• \( L \) — Inductance in Henrys (H)
• \( \mu \) — 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, higher permeability, and shorter coil length.

3. Importance of Inductance Calculation

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

4. Using the Calculator

Tips: Enter all values in the correct units. Permeability values: vacuum = 4π×10⁻⁷ H/m, iron ≈ 6.3×10⁻³ H/m, ferrite ≈ 1.26×10⁻⁵ to 1.26×10⁻³ H/m.

5. Frequently Asked Questions (FAQ)

Q1: What affects a coil's inductance?
A: Inductance increases with more turns, larger core area, higher permeability materials, and tighter winding (shorter length).

Q2: What are typical inductance values?
A: Small signal coils: μH to mH range, power transformers: mH to H range, large electromagnets: up to thousands of H.

Q3: How does core material affect inductance?
A: Ferromagnetic cores (iron, ferrite) increase inductance significantly compared to air cores.

Q4: What if my coil has multiple layers?
A: This formula is simplified for single-layer coils. Multi-layer coils require more complex calculations.

Q5: How accurate is this calculation?
A: It provides a good estimate for ideal solenoids. Real-world factors like winding spacing and core saturation affect actual inductance.