### Milliampere

**Definition:** A milliampere (symbol: mA) is a submultiple of the SI basic unit of electric current, the ampere. It is characterized as one thousandth of one ampere.

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**History/origin:** The milliampere has its origins in the ampere. The prefix "milli" suggests one thousandth that the basic unit that precedes, in this instance the ampere. The ampere deserve to be preceded by any of the metric prefixes in order come report systems in the desired magnitude.

**Current use:** as a submultiple of one SI unit, the milliampere is used worldwide, frequently for smaller measurements of electric current. Over there are countless devices the measure systems in regards to milliamperes such as galvanometers and ammeters, though these devices do not exclusively measure milliamperes.

### Ampere

**Definition:** The ampere (symbol: A), regularly referred come as merely amp, is the basic unit the electric current in the worldwide System of units (SI). The ampere is characterized formally based upon a solved value because that the elementary school charge, e, the 1.602176634 × 10-19 as soon as expressed in the unit C, i beg your pardon is same to A·s. The second is defined based upon the cesium frequency, ΔνCs. This meaning is effective since 2019, and is a far-reaching change from the previous an interpretation of the ampere.

**History/origin:** The ampere is named after Andre-Marie Ampere, a French mathematician and also physicist. In the centimeter-gram-second system of units, the ampere was defined as one tenth that the unit of electrical existing of the time, i beg your pardon is now known as the abampere. The size of the unit was chosen such the it would certainly fit conveniently within the metre-kilogram-second system of units. Prior to 2019, the ampere was characterized formally as the continuous current at which a force of 2 × 10-7 newtons per meter size would it is in produced in between two conductors, wherein the conductors are parallel, have infinite length, are put in a vacuum, and also have negligible circular cross-sections. In regards to the SI unit the charge, the coulomb, one ampere is characterized as one coulomb of charge passing v a given allude in one second. This an interpretation was an overwhelming to realize through high precision, and as together was readjusted to be an ext intuitive, and also easier come realize. Previously, due to the fact that the meaning included a reference to force, the SI kg, meter, and second needed to be defined prior to the ampere can be defined. Now, it is just dependent on the an interpretation of the second. One potential drawback of the redefinition is that vacuum permeability, vacuum permittivity, and also impedance of totally free space to be exact before the redefinition, but will now be subject to experimental error.

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**Current use:** as the SI basic unit of electrical current, the ampere is used worldwide for nearly all applications involving electrical current. An ampere can be to express in the kind of watts/volts, or W/V, such the an ampere equates to 1 W/V, since power is identified as a product that current and also voltage.

Ampere

### Milliampere to Ampere conversion Table

Milliampere0.01 mA | 1.0E-5 A |

0.1 mA | 0.0001 A |

1 mA | 0.001 A |

2 mA | 0.002 A |

3 mA | 0.003 A |

5 mA | 0.005 A |

10 mA | 0.01 A |

20 mA | 0.02 A |

50 mA | 0.05 A |

100 mA | 0.1 A |

1000 mA | 1 A |