Examples of ampere in the following topics:

 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:
 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.

 where I is the current through the conductor in amperes, V is the potential difference measured across the conductor in volts, and R is the resistance of the conductor in ohms (Ω).
 To solve this problem, we would just substitute the given values into Ohm's law: I = 1.5V/5Ω; I = 0.3 amperes.

 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:
 An ampere is the flow of one coulomb through an area in one second.

 This law is founded on the conservation of charge (measured in coulombs), which is the product of current (amperes) and time (seconds).

 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.

 where F is the force (in newtons, N), I is the current in the wire (in amperes, A), L is the length of the wire that is in the magnetic field (in m), and B is the magnetic field strength (in teslas, T).

 Substituting values of resistance and emf from the figure diagram and canceling the ampere unit gives:

 , where Q is electric charge in coulombs, t is time in seconds, I is electric current in amperes, and V is electric potential or voltage in volts.

 where the magnetic field is integrated over a curve (circumfrence of a wire), equivalent to integrating the current density (in amperes per square meter, Am2) over the cross section area of the wire (which is equal to the permeability constant times the enclosed current Ienc).

 The name is derived from the name for the SI unit for electric current, amperes (A).