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  2. Ampere balance - Wikipedia

    en.wikipedia.org/wiki/Ampere_balance

    The ampere balance (also current balance or Kelvin balance) is an electromechanical apparatus used for the precise measurement of the SI unit of electric current, the ampere. It was invented by William Thomson, 1st Baron Kelvin. The current to be measured is passed in series through two coils of wire, one of which is attached to one arm of a ...

  3. Kibble balance - Wikipedia

    en.wikipedia.org/wiki/Kibble_balance

    The Kibble balance is a development of the Ampere balance. The Kibble balance is a more accurate version of the ampere balance , an early current measuring instrument in which the force between two current-carrying coils of wire is measured and then used to calculate the magnitude of the current.

  4. Ampère - Wikipedia

    en.wikipedia.org/wiki/Ampère

    Ampere balance, an electromechanical apparatus for precise measurement of the ampere; Ampère's circuital law, a rule relating the current in a conductor to the magnetic field around it; Ampère's force law, the force of attraction or repulsion between two current-carrying wires

  5. Lord Kelvin - Wikipedia

    en.wikipedia.org/wiki/Lord_Kelvin

    He introduced a chain or series of effective instruments, including the quadrant electrometer, which cover the entire field of electrostatic measurement. He invented the current balance, also known as the Kelvin balance or Ampere balance (SiC), for the precise specification of the ampere, the standard unit of electric current.

  6. Ampere - Wikipedia

    en.wikipedia.org/wiki/Ampere

    This definition of the ampere was most accurately realised using a Kibble balance, but in practice the unit was maintained via Ohm's law from the units of electromotive force and resistance, the volt and the ohm, since the latter two could be tied to physical phenomena that are relatively easy to reproduce, the Josephson effect and the quantum ...

  7. Bryan Kibble - Wikipedia

    en.wikipedia.org/wiki/Bryan_Kibble

    In 1990, the Mark II watt balance was built, with the intent of measuring the Planck constant accurately enough to redefine the S.I. unit of the kilogramme from fundamental constants. Such an instrument equalises one force with another, specifically the weight of a [one-kilogramme, typically] test mass and the force produced by an electric ...

  8. Alternative approaches to redefining the kilogram - Wikipedia

    en.wikipedia.org/wiki/Alternative_approaches_to...

    The Kibble balance (known as a "watt balance" before 2016) is essentially a single-pan weighing scale that measures the electric power necessary to oppose the weight of a kilogram test mass as it is pulled by Earth's gravity. It is a variation of an ampere balance, with an extra

  9. Current balance - Wikipedia

    en.wikipedia.org/?title=Current_balance&redirect=no

    From Wikipedia, the free encyclopedia. Redirect page