Convert Amperes to Attoamperes
Convert Amperes (A) to Attoamperes (aA) instantly and accurately.
Conversion Formula
aA = A × 1.000000000e+18
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 Attoamperes
The attoampere (aA) equals 10⁻¹⁸ A, the scale of single-electron tunnelling currents in quantum devices. Individual electrons tunnelling through a molecular junction or quantum dot produce average currents of order 1-100 aA when measured at sub-microsecond resolution; cryogenic shot-noise electrometers achieve sub-attoampere sensitivity. 1 aA = 10⁻³ fA = 10⁻¹⁸ A.
Quick Reference Table
| Amperes (A) | Attoamperes (aA) |
|---|---|
| 1 A | 1 × 1018 aA |
| 2 A | 2 × 1018 aA |
| 5 A | 5 × 1018 aA |
| 10 A | 1 × 1019 aA |
| 25 A | 2.5 × 1019 aA |
| 50 A | 5 × 1019 aA |
| 100 A | 1 × 1020 aA |