268:), the perceived energy capacity of a small UPS product that has multiple DC outputs at different voltages but is simply listed with a single ampere-hour rating, e.g., 8800 mAh, would be exaggerated by a factor of 3.75 compared to that of a sealed 12-volt lead-acid battery where the ampere-hour rating, e.g., 7 Ah, is based on the total output voltage rather than the internal cell voltage, so the 12-volt output of the example UPS product can actually deliver only about a third of the energy of the example battery, not a quarter more energy. But a direct replacement product for the example battery, in the same form factor and comparable output voltage and energy capacity but based on
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248:, computation over charge values in ampere-hour requires precise data of voltage: in a battery system, for example, accurate calculation of the energy delivered requires integration of the power delivered (product of instantaneous voltage and instantaneous current) over the discharge interval. Generally, the battery voltage varies during discharge; an average value or nominal value may be used to approximate the integration of power.
280:, might also be specified as 7 Ah, here based on output voltage rather than cell chemistry. For consumers without an engineering background, these difficulties would be avoided by a specification of the watt-hour rating instead (or additionally).
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When comparing the energy capacities of battery-based products that might have different internal cell chemistries or cell configurations, a simple ampere-hour rating is often insufficient. For example, at 3.2 V for a
241:. This quantity is proportional to the total X-ray energy produced by a given X-ray tube operated at a particular voltage. The same total dose can be delivered in different time periods depending on the X-ray tube current.
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Since one ampere-hour can produce 0.336 grams of aluminium from molten aluminium chloride, producing a ton of aluminium required transfer of at least 2.98 million ampere-hours.
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Note 7 to entry: The coherent SI unit of electric charge is coulomb, C. The unit ampere-hour is used for electrolytic devices, such as storage batteries:
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vary in capacity but a large automobile propelled by an internal combustion engine would have about a 50-ampere-hour battery capacity.
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An average smartphone battery usually has between 2,500 and 4,000 milliampere-hours of electric capacity.
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X-ray Safety
Handbook, 9.0 Terms and Definitions, VirginiaTech Environmental, Health and Safety Services
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Guide for the Use of the
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T. L. Brown, H. E. Lemay Jr, "Chemistry the
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multiplied by time, equal to the charge transferred by a steady current of one
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477:"How to Calculate Amp Hours – Learn of Convert Watts to Amps"
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One ampere-hour is equal to (up to 4 significant figures):
195:) is one-thousandth of an ampere-hour (3.6 coulombs).
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has a capacity of about 2,000 to 3,000 milliampere-hours.
445:(A·h) ... to coulomb (C) ... Multiply by 3.6 E+03
406:. International Electrotechnical Commission (IEC). 2020
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The ampere-hour is frequently used in measurements of
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500:Meeting the energy needs of future warriors
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400:"electric charge (Symbol Q). IEV 113-02-10"
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498:National Research Council (U.S.) (2004).
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229:(mA⋅s) is a unit of measurement used in
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284:In other units of electric charge
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475:Efty Abir, Najrul Islam (2016).
172:flowing for one hour, or 3,600
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49:: AA battery (2500 mA⋅h)
54:AAA battery (1000 mA⋅h)
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547:Units of electrical charge
374:Electrochemical equivalent
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443:ampere hour
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332:equivalent)
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134:ampere-hour
126:3600 C
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33:ampere-hour
541:Categories
483:8 December
410:2020-09-20
386:References
325:abcoulombs
162:dimensions
189:mA h
183:(symbol:
160:, having
140:(symbol:
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460:Archived
368:See also
348:dry cell
338:Examples
306:faradays
304:0.03731
294:coulombs
211:and for
174:coulombs
146:A h
138:amp-hour
119:SI units
345:AA size
330:CGS-EMU
317:CGS-ESU
220:voltage
217:nominal
152:) is a
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381:(kW⋅h)
292:3,600
270:LiFePO
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256:cell (
246:energy
170:ampere
100:in ...
85:Symbol
437:(PDF)
524:ISBN
504:ISBN
485:2016
323:360
185:mA⋅h
154:unit
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193:mAh
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