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  2. Ampere - Wikipedia

    en.wikipedia.org/wiki/Ampere

    Ampère's force law [15] [16] states that there is an attractive or repulsive force between two parallel wires carrying an electric current. This force is used in the formal definition of the ampere. The SI unit of charge, the coulomb, was then defined as "the quantity of electricity carried in 1 second by a current of 1 ampere".

  3. Ammeter - Wikipedia

    en.wikipedia.org/wiki/Ammeter

    Demonstration model of a moving iron ammeter. As the current through the coil increases, the plunger is drawn further into the coil and the pointer deflects to the right. An ammeter (abbreviation of ampere meter) is an instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. For direct ...

  4. Current clamp - Wikipedia

    en.wikipedia.org/wiki/Current_clamp

    An electrical meter with integral AC current clamp is known as a clamp meter, clamp-on ammeter, tong tester, or colloquially as an amp clamp. A clamp meter measures the vector sum of the currents flowing in all the conductors passing through the probe, which depends on the phase relationship of the currents. Only one conductor is normally ...

  5. SI base unit - Wikipedia

    en.wikipedia.org/wiki/SI_base_unit

    ampere: A electric current "The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 × 10 −19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of ∆ν Cs." [1]

  6. Electric current - Wikipedia

    en.wikipedia.org/wiki/Electric_current

    A flow of positive charges gives the same electric current, and has the same effect in a circuit, as an equal flow of negative charges in the opposite direction. Since current can be the flow of either positive or negative charges, or both, a convention is needed for the direction of current that is independent of the type of charge carriers .

  7. Current sensing - Wikipedia

    en.wikipedia.org/wiki/Current_sensing

    A significant drawback of a resistor sensor is the unavoidable electrical connection between the current to be measured and the measurement circuit. An isolation amplifier can provide electrical isolation between measured current and the rest of the measurement circuit. However, these amplifiers are expensive and can also limit the bandwidth ...

  8. Electrical measurements - Wikipedia

    en.wikipedia.org/wiki/Electrical_measurements

    Electrical measurements are the methods, devices and calculations used to measure electrical quantities. Measurement of electrical quantities may be done to measure electrical parameters of a system. Using transducers, physical properties such as temperature, pressure, flow, force

  9. Orders of magnitude (current) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(current)

    "Sq" current of one daytime vortex within the ionospheric dynamo region: 180 kA Typical current used in electric arc furnace for ferroalloys [11] 10 6: 1 MA High range of Birkeland current: 5 MA Flux tube between Jupiter and Io (moon) [12] 26 MA Sandia National Laboratories, Z machine approximate firing current [13] since 2007 256 MA

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