### Milliampere

**Definition:** A milliampere (symbol: mA) is a submultiple that the SI basic unit of electrical current, the ampere. The 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 of the base unit it precedes, in this instance the ampere. The ampere have the right to be came before by any kind of of the metric prefixes in order to report systems in the preferred magnitude.

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

### Ampere

**Definition:** The ampere (symbol: A), often referred to as just amp, is the base unit the electric current in the international System of devices (SI). The ampere is identified formally based upon a addressed value for the elementary 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 on the cesium frequency, ΔνCs. This an interpretation is effective due to the fact that 2019, and is a far-reaching change from the previous definition of the ampere.

**History/origin:** The ampere is called after Andre-Marie Ampere, a French mathematician and physicist. In the centimeter-gram-second device of units, the ampere was identified as one tenth that the unit the electrical current of the time, which is now well-known as the abampere. The dimension of the unit was preferred such the it would certainly fit conveniently in ~ the metre-kilogram-second system of units. Before 2019, the ampere was identified formally together the continuous current in ~ which a force of 2 × 10-7 newtons per meter size would be produced between two conductors, wherein the conductors room parallel, have actually infinite length, are put in a vacuum, and have negligible circular cross-sections. In terms of the SI unit the charge, the coulomb, one ampere is identified as one coulomb of charge passing through a given suggest in one second. This meaning was complicated to realize with high precision, and also as such was adjusted to be more intuitive, and also easier come realize. Previously, since the an interpretation included a reference to force, the SI kg, meter, and second needed to it is in defined before the ampere might be defined. Now, that is only dependent top top the definition of the second. One potential drawback of the redefinition is the vacuum permeability, vacuum permittivity, and also impedance of free space to be exact before the redefinition, yet will currently be topic to experimental error.

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**Current use:** together the SI base unit of electrical current, the ampere is used worldwide for practically all applications involving electrical 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, because power is defined as a product that current and also 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 |