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500 – 830 mA 120 V AC Tungsten incandescent light bulb (60–100 W) 10 0: 1A Typical iPhone charger (5 W) 1.35A Tesla coil, 0.76 meters (2 ft 6 in) high, at 200 kV and 270 kV peak [4] 2.1A High power LED current (peak 2.7 A) [5] 5A One typical 12 V motor vehicle headlight (typically 60 W) 9A 230 V AC, toaster, kettle (2 kW) 10 1: 10 or 20A
As of the 2019 revision of the SI, the ampere is defined by fixing the elementary charge e to be exactly 1.602 176 634 × 10 −19 C, [6] [9] which means an ampere is an electric current equivalent to 10 19 elementary charges moving every 1.602 176 634 seconds or 6.241 509 074 × 10 18 elementary charges moving in a second.
The coulomb was originally defined, using the latter definition of the ampere, as 1 A × 1 s. [4] ... One ampere hour equals 3600 C, hence 1 mA⋅h = 3.6 C.
The ampere-hour is frequently used in measurements of electrochemical systems such as electroplating and for battery capacity where the commonly known nominal voltage is understood. A milliampere second (mA⋅s) is a unit of measurement used in X-ray imaging, diagnostic imaging, and radiation therapy. It is equivalent to a millicoulomb.
Symbol [1] Name of quantity Unit name Symbol Base units E energy: joule: J = C⋅V = W⋅s kg⋅m 2 ⋅s −2: Q electric charge: coulomb: C A⋅s I electric current: ampere
The ampere is an SI base unit and electric current is a base quantity in the International System of Quantities (ISQ). [ 4 ] : 15 Electric current is also known as amperage and is measured using a device called an ammeter .
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An integrating current meter calibrated in ampere-hours or charge ... a movement with a full-scale voltage of 50 mV and desired current ranges of 10 mA, 100 mA, and 1 ...