A SI base
Measures: Electric current — how much charge flows
Ampere
How much electric charge flows past per second.
Electric currentHow it's defined
Since 2019, defined by fixing the elementary charge at exactly 1.602176634×10⁻¹⁹ coulombs — one ampere is one coulomb of charge per second, now literally a count of electrons.
1 A = 1 C/s — exact
Convert — honestly
This unit has no convertible siblings on the map yet.
Where you meet it
- Fuse ratings and phone-charger labels
- Energii-to-be — current × voltage is power
Other ways to measure electric current
On this map, it stands alone for its quantity.
Source
This page is an authored summary of the authoritative definition — checkable one click away.
NIST — SI Redefinition (2019)