### Milliampere

**Definition:** A milliampere (symbol: mA) is a submultiple that the SI base unit of electrical current, the ampere. That is characterized as one thousandth of one ampere.

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**History/origin:** The milliampere has its beginnings in the ampere. The prefix "milli" suggests one thousandth that the base unit the precedes, in this instance the ampere. The ampere have the right to be preceded by any type of of the metric prefixes in order come report units in the wanted magnitude.

**Current use:** together a submultiple of one SI unit, the milliampere is used worldwide, regularly for smaller dimensions of electrical current. There are many devices that measure systems in regards to milliamperes such as galvanometers and also ammeters, though these gadgets do not exclusively measure milliamperes.

### Ampere

**Definition:** The ampere (symbol: A), frequently referred come as just amp, is the basic unit that electric current in the international System of units (SI). The ampere is characterized formally based upon a resolved value because that the elementary charge, e, of 1.602176634 × 10-19 when expressed in the unit C, which is same to A·s. The 2nd is defined based on the cesium frequency, ΔνCs. This an interpretation is effective because 2019, and also is a far-reaching change native the previous meaning of the ampere.

**History/origin:** The ampere is called after Andre-Marie Ampere, a French mathematician and also physicist. In the centimeter-gram-second device of units, the ampere was characterized as one tenth the the unit that electrical present of the time, which is now known as the abampere. The dimension of the unit was favored such the it would fit conveniently within the metre-kilogram-second system of units. Before 2019, the ampere was characterized formally together the continuous current in ~ which a pressure of 2 × 10-7 newtons per meter length would be produced between two conductors, wherein the conductors space parallel, have infinite length, are inserted in a vacuum, and have negligible one cross-sections. In regards to the SI unit of charge, the coulomb, one ampere is defined as one coulomb of fee passing through a given allude in one second. This an interpretation was complicated to realize through high precision, and as together was readjusted to be an ext intuitive, and also easier to realize. Previously, since the an interpretation included a recommendation to force, the SI kg, meter, and second needed to be defined prior to the ampere could be defined. Now, it is only dependent top top the an interpretation of the second. One potential border of the redefinition is that vacuum permeability, vacuum permittivity, and impedance of complimentary space were exact before the redefinition, however will now be subject to experimental error.

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**Current use:** together the SI basic unit of electric current, the ampere is used worldwide for virtually all applications involving electric current. An ampere can be to express in the form of watts/volts, or W/V, such the an ampere amounts to 1 W/V, due to the fact that power is defined as a product the current and voltage.

Ampere

### Milliampere to Ampere switch 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 |