Ampere hour - Revision history

Jmdonev: 1 revision imported

2018-05-11T18:17:06Z

1 revision imported

← Older revision	Revision as of 18:17, 11 May 2018
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Jmdonev at 21:04, 9 May 2018

2018-05-09T21:04:58Z

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-<onlyinclude>An '''ampere hour''' (abbreviated A<math>\cdot</math>h or amp hr) is a [[units|unit]] of electric [[charge]], usually used for [[battery|batteries]]. This unit combines the amount of [[current]] with how long that current can be sustained until the battery completely discharges.</onlyinclude> Large batteries have several ampere hours but cell phones and other small devices have batteries with a total charge measured in milliampere hours.
+<onlyinclude>An '''ampere hour''' (abbreviated A<math>\cdot</math>h or amp hr) is a [[units|unit]] of electric [[charge]], usually used for [[battery|batteries]]. This unit combines the amount of [[current]] with how long that current can be sustained until the battery completely discharges.</onlyinclude><ref name=B>R.T.  Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 3, sec. 3.4, pp. 90.</ref> Large batteries have several ampere hours but cell phones and other small devices have batteries with a total charge measured in milliampere hours. This measured quantity is called [[battery capacity]].<ref name=B/>
 The number of amp-hours in a battery is found by multiplying the amount of current (in [[ampere]]s) by the time (in [[hour]]s) a given current could flow before the battery runs out. This calculation gives the total amount of charge transferred. This unit is useful since a battery will be able to supply current for a longer period of time, than say a [[capacitor]]. [[Chemical reaction]]s inside the battery are limited by the amount of material that can be eaten away, and how quickly, this means that to test the ampere hours of a battery one should use a low current relative to the battery's peak current capability.
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 To learn more about the ampere hour please see Dr. Rowlett's [http://www.unc.edu/~rowlett/units/dictA.html#ampere dictionary of units].
 [[Category:Uploaded]]

Jmdonev at 20:16, 16 September 2017

2017-09-16T20:16:52Z

← Older revision		Revision as of 20:16, 16 September 2017
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	[[Category:Done 2015-09-05]]		[[Category:Done 2015-09-05]]
	<onlyinclude>An '''ampere hour''' (abbreviated A<m>\cdot</m>h or amp hr) is a [[units\|unit]] of electric [[charge]], usually used for [[battery\|batteries]]. This unit combines the amount of [[current]] with how long that current can be sustained until the battery completely discharges.</onlyinclude> Large batteries have several ampere hours but cell phones and other small devices have batteries with a total charge measured in milliampere hours.		<onlyinclude>An '''ampere hour''' (abbreviated A<math>\cdot</math>h or amp hr) is a [[units\|unit]] of electric [[charge]], usually used for [[battery\|batteries]]. This unit combines the amount of [[current]] with how long that current can be sustained until the battery completely discharges.</onlyinclude> Large batteries have several ampere hours but cell phones and other small devices have batteries with a total charge measured in milliampere hours.

	The number of amp-hours in a battery is found by multiplying the amount of current (in [[ampere]]s) by the time (in [[hour]]s) a given current could flow before the battery runs out. This calculation gives the total amount of charge transferred. This unit is useful since a battery will be able to supply current for a longer period of time, than say a [[capacitor]]. [[Chemical reaction]]s inside the battery are limited by the amount of material that can be eaten away, and how quickly, this means that to test the ampere hours of a battery one should use a low current relative to the battery's peak current capability.		The number of amp-hours in a battery is found by multiplying the amount of current (in [[ampere]]s) by the time (in [[hour]]s) a given current could flow before the battery runs out. This calculation gives the total amount of charge transferred. This unit is useful since a battery will be able to supply current for a longer period of time, than say a [[capacitor]]. [[Chemical reaction]]s inside the battery are limited by the amount of material that can be eaten away, and how quickly, this means that to test the ampere hours of a battery one should use a low current relative to the battery's peak current capability.

J.williams: 1 revision imported

2015-09-03T18:21:55Z

1 revision imported

← Older revision	Revision as of 18:21, 3 September 2015
(No difference)

Jmdonev at 20:56, 27 August 2015

2015-08-27T20:56:46Z

← Older revision		Revision as of 20:56, 27 August 2015
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	[[Category:Done 2015-02-15]]		[[Category:Done 2015-09-05]]
	<onlyinclude>An '''ampere hour''' (abbreviated A<m>\cdot</m>h or amp hr) is a unit of electric [[charge]], usually used for [[battery\|batteries]]. This [[unit]] combines the amount of [[current]] with how long that current can be sustained until the battery completely discharges.</onlyinclude> Large batteries have several ampere hours but cell phones and other small devices have batteries with a total charge measured in milliampere hours.		<onlyinclude>An '''ampere hour''' (abbreviated A<m>\cdot</m>h or amp hr) is a [[units\|unit]] of electric [[charge]], usually used for [[battery\|batteries]]. This unit combines the amount of [[current]] with how long that current can be sustained until the battery completely discharges.</onlyinclude> Large batteries have several ampere hours but cell phones and other small devices have batteries with a total charge measured in milliampere hours.

	The number of amp-hours in a battery is found by multiplying the amount of current (in [[ampere]]s) by the time (in [[hour]]s) a given current could flow before the battery runs out. This calculation gives the total amount of charge transferred. This unit is useful since a battery will be able to supply current for a longer period of time, than say a [[capacitor]]. [[Chemical reaction]]s inside the battery are limited by the amount of material that can be eaten away, and how quickly, this means that to test the ampere hours of a battery one should use a low current relative to the battery's peak current capability.		The number of amp-hours in a battery is found by multiplying the amount of current (in [[ampere]]s) by the time (in [[hour]]s) a given current could flow before the battery runs out. This calculation gives the total amount of charge transferred. This unit is useful since a battery will be able to supply current for a longer period of time, than say a [[capacitor]]. [[Chemical reaction]]s inside the battery are limited by the amount of material that can be eaten away, and how quickly, this means that to test the ampere hours of a battery one should use a low current relative to the battery's peak current capability.

J.williams: 1 revision imported

2015-08-26T21:30:41Z

1 revision imported

← Older revision	Revision as of 21:30, 26 August 2015
(No difference)

J.williams at 22:43, 11 August 2015

2015-08-11T22:43:53Z

New page

[[Category:Done 2015-02-15]]
<onlyinclude>An '''ampere hour''' (abbreviated A<m>\cdot</m>h or amp hr) is a unit of electric [[charge]], usually used for [[battery|batteries]]. This [[unit]] combines the amount of [[current]] with how long that current can be sustained until the battery completely discharges.</onlyinclude> Large batteries have several ampere hours but cell phones and other small devices have batteries with a total charge measured in milliampere hours.

The number of amp-hours in a battery is found by multiplying the amount of current (in [[ampere]]s) by the time (in [[hour]]s) a given current could flow before the battery runs out. This calculation gives the total amount of charge transferred. This unit is useful since a battery will be able to supply current for a longer period of time, than say a [[capacitor]]. [[Chemical reaction]]s inside the battery are limited by the amount of material that can be eaten away, and how quickly, this means that to test the ampere hours of a battery one should use a low current relative to the battery's peak current capability.

1 Ah = 3,600 [[Coulomb]]s

Often the amp hour is written on the side of a [[battery]], which has a [[voltage]] (often 1.5 [[volt|V]]). An ampere hour at 1 volt is a unit of [[energy]], specifically the [[watt-hour]] (1/1000th of a [[kWh]]).

To learn more about the ampere hour please see Dr. Rowlett's [http://www.unc.edu/~rowlett/units/dictA.html#ampere dictionary of units].
[[Category:Uploaded]]