Ampere (A)
SI base unit of electric current, defined by fixing the elementary charge e = 1.602176634 × 10⁻¹⁹ C.
What is an ampere?
- Symbol
- A
- Quantity
- Electric Current
- Unit system
- SI
- Definition
- SI base unit of electric current, defined by fixing the elementary charge e = 1.602176634 × 10⁻¹⁹ C.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
The SI base unit of current. Used for fuses, circuit breakers, chargers and appliance ratings.
Ampere in other electric current units
- 1 A = 0.001 kAAmpere to Kiloampere converter
- 1 A = 1000 mAAmpere to Milliampere converter
- 1 A = 1000000 µAMicroampere
- 1 A = 1000000000 nANanoampere
- 1 A = 0.1 abAAbampere (biot)
- 1 A = 2997924580 statAStatampere
Ampere quick reference
| Ampere | Kiloampere | Milliampere | Microampere |
|---|---|---|---|
| 1 A | = 0.001 kA | = 1000 mA | = 1000000 µA |
| 10 A | = 0.01 kA | = 10000 mA | = 10000000 µA |
| 100 A | = 0.1 kA | = 100000 mA | = 100000000 µA |
| 1000 A | = 1 kA | = 1000000 mA | = 1000000000 µA |
Where the ampere fits
The next smaller electric current unit is the milliampere (mA). 1 A = 1000 mA, and 1 mA = 0.001 A.
The next larger electric current unit is the abampere (abA). 1 A = 0.1 abA, and 1 abA = 10 A.
Frequently asked questions
- How many kiloamperes are in one ampere?
- One ampere = 0.001 kA (kiloamperes).
- How many milliamperes are in one ampere?
- One ampere = 1000 mA (milliamperes).
- How many microamperes are in one ampere?
- One ampere = 1000000 µA (microamperes).