**What is Ampere?**

**Ampere or ‘amp’** is a unit of electric current denoted by A. The rate of electron flow in an electrical conductor is measured in Ampere.

One ampere of current represents one coulomb of electrical charge,

i.e. \(6.24\times 10^{18}\) charge carriers, moving in one second.

It is one of the seven basic SI units. It is named after a French Physicist and Mathematician Andre- Marie Ampere, who is considered as the ‘Father of Electrodynamics’.

Current is a count of a number of electrons that flows through a circuit. One ampere is the amount of produced by force of one volt acting through the resistance of one ohm. The ampere is nearly equal to one coulomb per second. As said earlier, Amperes helps to express the rate of flow of electrical charge. In any given point experiencing a current, if the charge on particles moving through it increases, the ampere value will increase proportionately.

It is to be noted that, ampere and coulomb are two different units. Coulomb is also called as Ampere – second or Ampere – hour. As per SI units, constant and average current are expressed in Amperes.

**1 A = 1 C/s**

**History:**

The original definition of Ampere was different. It used to be one tenth of the unit of electric current in centimetre – gram – second system of units. Now, those units are called abampere, which is defined as the amount of current that produces a force of two dynes per centimetre of length in between two wires that are at one-centimetre distance.

**Table of Ampere Unit Prefixes:**

Name |
Symbol |
Conversion |
Exapmle |

microampere(microamps) | A | 1A = 10-6A | I = 40A |

milliampere(milliamps) | mA | 1mA = 10-3A | I = 2mA |

ampere (amps) | A | – | I = 20A |

kiloampere(kiloamps) | kA | 1kA = 103 | I = 4kA |

**Conversion of amps(A) to kiloamps(kA): **

current I in kiloamperes (kA) = current I in amperes (A) . 1000:

**I****(mA)**** = I****(A)**** / 1000**

**I****(kA)**** = I****(A)**** . 1000**

**Conversion amps(A) to milliamps(mA):**

current I in milliamperes (mA) = current I in amperes (A) / 1000:

**I****(mA)**** = I****(A)**** / 1000**

**Conversion of amps(A) to microamps(****A):**

current I in microamperes (μA) = current I in amperes (A) / 1000000:

**I****(μA)**** = I****(A)**** / 1000000**

**Conversion of amps(A) to volts(V):**

Voltage V in volts(V) = power P in watts (W) / current I in amperes (A):

**V****(V)**** = P****(W)**** / I****(A)**

voltage V in volts(V) = current I in amperes (A) . resistance R in ohms (\(\Omega\)):

**V****(V) ****= I****(A)**** . R****(\(\Omega\))**

**Conversion of amps(A) to watts (W):**

power P in watts(W) = current I in amps (A) . voltage V in volts (V):

**P****(W) **** = I****(A) ****. V****(V)**

**Conversion of amps to ohms (\(\Omega\)):**

resistance R in ohms (\(\Omega\) ) = voltage V in volts (V) / current I in amperes (A):

**R****(\(\Omega\)) ****=**** ****V****(V) ****/ I****(A)**

**Conversion of amps to kilowatts (kW):**

power P in kilowatts (kW) = current I in amperes (A) . voltage V in volts (V) / 1000:

**P****(kW) **** = I****(A) ****. V****(V) ****/ 1000**</span

**Conversion of amps to coulombs (C):**

electric charge Q in coulombs (C) = current I in amps (A) . time of current flow t in seconds (s):

**Q****(C)**** = I****(A)**** ⋅ t****(s)**

**Ampere meter:**

Ampere meter, commonly known as Ammeter is an electrical instrument used to measure electrical current in Amperes. Electrical current on the load is measured with the help of Ampere meter by connecting it in series to the load. It has zero resistance and so measured circuit remains unaffected.

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