ampere
(noun)Definition of ampere
A unit of electrical current; the standard base unit in the International System of Units. Abbreviation: amp. Symbol: A.
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Examples of ampere in the following topics:

Magnetic Force Between Two Parallel Conductors
 The force between currentcarrying wires is used as part of the operational definition of the ampere.
 For parallel wires placed one meter away from one another, each carrying one ampere, the force per meter is: $\frac {F}{l}=\frac{(4\pi \texttimes 10^{7} T \cdot m/A)(1A)^2}{(2\pi )(1m)}=2 \texttimes 10^{7}N/m$ The final units come from replacing T with 1N/(A×m).
 Incidentally, this value is the basis of the operational definition of the ampere.
 This means that one ampere of current through two infinitely long parallel conductors (separated by one meter in empty space and free of any other magnetic fields) causes a force of 2×107 N/m on each conductor.

Overview
 The SI unit for current is the ampere (A), named for the French physicist AndréMarie Ampère (1775–1836).
 Since I=ΔQ/Δt, we see that an ampere is one coulomb per second: $1 \ A = 1 \ C/s$ The flow of electricity requires a medium in which charge can flow .

Energy Stored in a Magnetic Field
 The formula for this energy is given as: $E = \frac{1}{2} LI^2$ (Eq. 1), where L is the inductance in units of Henry and I is the current in units of Ampere.

ParallelPlate Capacitor
 Capacitors are limited in their ability to prevent charge flow from one conductive surface to the other; their ability to hold charge is measured in Farads (F), which are defined as 1 amperesecond per volt, one joule per square volt and one Coulomb per volt, among other ways.

Applications
 Considering loop abcdea, we can use Kirchhoff's loop rule: $I_2R_2+ \mathrm{emf}_1I_2r_1I_1R_1=I_2(R_2)+r_1)+\mathrm{emf}_1I_1R_1=0$ Substituting values of resistance and emf from the figure diagram and canceling the ampere unit gives: $3I_2+186I_1=0$ This is the second part of a system of three equations that we can use to find all three current values.