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The ampere is named for French physicist and mathematician André-Marie Ampère (1775–1836), who studied electromagnetism and laid the foundation of electrodynamics.In recognition of Ampère's contributions to the creation of modern electrical science, an international convention, signed at the 1881 International Exposition of Electricity, established the ampere as a standard unit of ...
An ampere-hour or amp-hour (symbol: A⋅h or A h; often simplified as Ah) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs. [1] [2]
Some meters measure currents as low as milliamps or even microamps. All meters have a burden voltage (caused by the combination of the shunt used and the meter's circuit design), and some (even expensive ones) have sufficiently high burden voltages that low current readings are seriously impaired. Meter specifications should include the burden ...
Electrical injury; Other names: Electrical shock: Lightning injury caused by a nearby lightning strike.The slight branching redness (sometimes called a Lichtenberg figure) travelling up the leg was caused by the effects of current.
Ammeter from the old New York Penn Station terminal service plant in New York City. The relation between electric current, magnetic fields and physical forces was first noted by Hans Christian Ørsted in 1820, who observed a compass needle was deflected from pointing North when a current flowed in an adjacent wire.
Many companies manufacture microcurrent devices for both professional and personal use, [10] [citation needed] [11] [12] and microcurrent stimulation is used as a "complementary" veterinary modality. [ 13 ]
A typical TASER device can operate with a peak voltage of 50 kilo volts (1200 Volts to the body), an electric current of 1.9 milliamps, at for example 19 100 microsecond pulses per second. [35] A supplier quotes a current of 3-4 milliamps.
D cell batteries, wooden matchstick for scale. A D battery (D cell or IEC R20) is a standardized size of a dry cell.A D cell is cylindrical with an electrical contact at each end; the positive end has a nub or bump.