Convert Amperes to Gigaamperes
Convert Amperes (A) to Gigaamperes (GA) instantly and accurately.
Conversion Formula
GA = A × 1.000000000e-9
About Amperes
The ampere (A) is the SI base unit of electric current, defined since 2019 by fixing the elementary charge e = 1.602 176 634 × 10⁻¹⁹ C. One ampere corresponds to approximately 6.241 × 10¹⁸ electrons passing a cross-section per second. Common benchmarks: a 60 W incandescent lamp draws 0.5 A at 120 V; household circuit breakers protect at 10-30 A; a car starter motor draws 100-200 A on cranking.
About Gigaamperes
The gigaampere (GA) equals 10⁹ A, a scale that lies beyond any man-made device and arises only in extreme astrophysical or geophysical contexts. Large-scale magnetospheric Birkeland field-aligned currents between Earth's ionosphere and magnetosphere are estimated at 1-10 MA total, well below 1 GA; however, pulsar magnetosphere discharge models and neutron-star lightning analogues are sometimes expressed in gigaampere terms. 1 GA = 10⁹ A = 10³ MA.
Quick Reference Table
| Amperes (A) | Gigaamperes (GA) |
|---|---|
| 1 A | 1 × 10-9 GA |
| 2 A | 2 × 10-9 GA |
| 5 A | 5 × 10-9 GA |
| 10 A | 1 × 10-8 GA |
| 25 A | 2.5 × 10-8 GA |
| 50 A | 5 × 10-8 GA |
| 100 A | 1 × 10-7 GA |