Ampere-turn (At)
SI unit of magnetomotive force: one ampere flowing through one turn of a coil. Dimensionally equal to the ampere.
What is an ampere-turn?
- Symbol
- At
- Quantity
- Magnetomotive Force
- Unit system
- SI
- Definition
- SI unit of magnetomotive force: one ampere flowing through one turn of a coil. Dimensionally equal to the ampere.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used in designing electromagnets, relays, solenoids, motors and transformers to state the magnetizing effect of a coil.
Ampere-turn in other magnetomotive force units
- 1 At = 0.001 kAtKiloampere-turn
- 1 At = 1000 mAtMilliampere-turn
- 1 At ≈ 1.256637061 GiAmpere-turn to Gilbert converter
- 1 At = 0.1 abAtAbampere-turn
Ampere-turn quick reference
| Ampere-turn | Gilbert | Kiloampere-turn | Milliampere-turn |
|---|---|---|---|
| 1 At | ≈ 1.256637061 Gi | = 0.001 kAt | = 1000 mAt |
| 10 At | ≈ 12.56637061 Gi | = 0.01 kAt | = 10000 mAt |
| 100 At | ≈ 125.6637061 Gi | = 0.1 kAt | = 100000 mAt |
| 1000 At | ≈ 1256.637061 Gi | = 1 kAt | = 1000000 mAt |
Where the ampere-turn fits
The next smaller magnetomotive force unit is the gilbert (Gi). 1 At ≈ 1.256637061 Gi, and 1 Gi ≈ 0.7957747155 At.
The next larger magnetomotive force unit is the abampere-turn (abAt). 1 At = 0.1 abAt, and 1 abAt = 10 At.
Frequently asked questions
- How many gilberts are in one ampere-turn?
- One ampere-turn ≈ 1.256637061 Gi (gilberts).
- How many kiloampere-turns are in one ampere-turn?
- One ampere-turn = 0.001 kAt (kiloampere-turns).
- How many milliampere-turns are in one ampere-turn?
- One ampere-turn = 1000 mAt (milliampere-turns).