ampere

• 安培是国际单位制中电流的基本单位，符号为A，定义为每秒通过1库仑电荷的恒定电流。历史上也曾指略小于现行标准的旧单位。

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.

   安培

   • 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.

   同义词amp

2. Historical unit of electric currentC2formalscientific

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

   历史上的电流单位

   • 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.