ampere

• Substantivo que designa a unidade básica de corrente elétrica no Sistema Internacional de Unidades (SI), ou, historicamente, uma unidade ligeiramente menor usada antes do padrão SI.

A noun referring to the base unit of electric current in the International System of Units (SI), or historically a slightly smaller unit used before the SI standard.

1. SI unit of electric currentC1formalscientific

   The base unit of electric current in the International System of Units (SI), defined as the constant current that, when maintained in two straight parallel conductors of infinite length and negligible cross-section placed one meter apart in a vacuum, produces a force of 2 × 10⁻⁷ newtons per meter between them.

   Ampère

   • The circuit carries a current of 5 amperes.
   • An ampere is a fundamental unit in electrical engineering.
   • The device draws 0.5 amperes of current.

   Sinônimosamp

2. Historical unit of electric currentC2formalscientific

   A former, slightly smaller unit of electric current that was used before the modern SI definition was adopted.

   Unidade histórica de corrente elétrica

   • The old ampere was slightly different from the modern one.
   • Historical texts often refer to the earlier definition of the ampere.
   • The difference between the old and new ampere is minimal.