Convert Amperes to Femtoamperes
Convert Amperes (A) to Femtoamperes (fA) instantly and accurately.
Conversion Formula
fA = A × 1000000000000000
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 Femtoamperes
The femtoampere (fA) equals 10⁻¹⁵ A, encountered in patch-clamp background noise, advanced CMOS sub-threshold leakage, and electrochemical scanning probe measurements. Individual ion channels in biological membranes produce baseline noise currents of a few femtoamperes; the off-state leakage of a modern 3 nm transistor is well below 1 fA per device. 1 fA = 10⁻³ pA = 10³ aA.
Quick Reference Table
| Amperes (A) | Femtoamperes (fA) |
|---|---|
| 1 A | 1 × 1015 fA |
| 2 A | 2 × 1015 fA |
| 5 A | 5 × 1015 fA |
| 10 A | 1 × 1016 fA |
| 25 A | 2.5 × 1016 fA |
| 50 A | 5 × 1016 fA |
| 100 A | 1 × 1017 fA |