international ampere
Definition
- Noun:
- A former unit of electric current: The "international ampere" was a historical, standardized unit for measuring the flow of electric charge. It was defined slightly smaller than the modern SI (Système International) ampere, which is now the universally accepted base unit for electric current.
Usage
- The term "international ampere" is used in historical or technical contexts when referring to measurements made before the universal adoption of the SI system. It is not used in modern scientific work.
- Example: "Early 20th-century electrical specifications were often given in international amperes."
Advanced Usage
- The international ampere was part of a system of "international units" for electricity, established in 1908. It was superseded by the absolute, or SI, ampere in 1948.
- Example: "Converting data from old journals requires knowing that 1 international ampere is approximately 0.99985 SI amperes."
Variants and Related Words
- Ampere (A) (n): The SI base unit of electric current, defined by the force between two parallel conductors. This is the modern, current unit.
- Current (n): The flow of electric charge, of which the ampere is the unit.
- SI unit (n): A unit from the modern International System of Units.
Synonyms
- Historical ampere: A synonym emphasizing its obsolete status.
- Old ampere: An informal term indicating it is not the contemporary unit.
Notes on Meaning
- This word has only one specific meaning: a precise, obsolete unit of electric current. It does not have idiomatic or figurative uses. It is a technical term from the history of science and metrology.
Noun
-
a former unit of electric current (slightly smaller than the SI ampere)
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