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Magnetomotive force Converter

Convert magnetomotive force units like ampere-turn, gilbert.

Convert Units

From:

To:

Result:

Convert magnetomotive force measurements between ampere-turn, gilbert, and more.

What is Magnetomotive Force Converter?

Magnetomotive force (MMF) is the driving force that establishes magnetic flux in a magnetic circuit, analogous to voltage in an electric circuit. It is produced by current flowing through coil windings and determines the strength of electromagnets, transformers, and motors.

Understanding the Units

Ampere-turn (At)

The SI unit of MMF. Product of current (amperes) and number of coil turns.

Common Uses: Electromagnet design, transformer specifications, motor windings

Gilbert (Gi)

The CGS unit of magnetomotive force.

Common Uses: Older electromagnetic literature

Conversion: 1 At ≈ 1.2566 Gi

Common Conversions

Small solenoid valve coil: 50–200 At
Relay coil: 100–500 At
DC motor field winding: 500–5,000 At
1 Ampere-turn ≈ 1.2566 Gilbert

Conversion Formulas

MMF = Number of turns × Current (F = N × I)
Magnetic circuit Ohm's Law: F = Φ × Rm (flux × reluctance)
Ampere-turn to gilbert: Gi = At × 1.2566
Gilbert to ampere-turn: At = Gi ÷ 1.2566

Practical Examples

Electromagnet: 500 turns × 2 A = 1,000 At — sufficient to lift heavy iron objects

Relay coil: 1,000 turns × 50 mA = 50 At to close contacts

Transformer primary: 500 turns × 1 A = 500 At MMF drives the core flux

MRI magnet superconducting coil: millions of At to achieve 3 T field

When to Use Each Unit

Ampere-turn (At): Modern SI-based magnetic circuit and electromagnet design

Gilbert (Gi): CGS system, older electromagnetic engineering references

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