Talk:Ampere-hour

This is the discussion/talk page for article: Ampere-hour.

Topics from 2006

E=QV

It says here E=CV, though I doubt this is the case. C is commonly used for capaciTANCE (a different yet extremely common parameter in electricity) while Q is used for charge. While it's possible in the same circles where mAh are used, (rather than Coulombs) C is used for capacity, I doubt this. -Oreo Priest ((talk)) at 02:05, 9 June 2006

Unit of measurement

Variables should not have an associated unit of measurement. Those equations should be correct *despite* ones use of units (as long as the units are properly tracked). Fresheneesz 02:11, 12 August 2006 (UTC)

Battery description

All the stuff about batteries should be moved to the battery (electricity) article. Articles about a unit of measure should not be dominated by one use of that unit. --Wtshymanski 22:34, 17 November 2006 (UTC)

sorry, I don't agree, I've just been looking this unit of mesurament up in regard to batteries details and that info has been very useful to me. —192.33.238.6 (talk) 15:30, 5 April 2007 (UTC).

Ummm... I was just about to add all that stuff, not realizing you deleted it. You didn't even include a link? — Omegatron 02:49, 14 September 2007 (UTC)

17-Oct-2008: (1 year later) I have added some small examples, using batteries, to help relate the terms "ampere-hour" or "mAh" for general users, as in cordless phones or iPod batteries. Examples don't have to cover a vast array of applications, just provide some common-place use of the concepts. After revising many complex articles (tagged "too-technical"), I've found that using examples can often simplify the wording, while an abstract, precise definition is often tagged as "too-technical" for general readers. A mathematically pure set of ideal, abstract articles just will not work for informing general readers about units of measurement. However, a hybrid approach has worked by splitting articles into sections, where math formulas can be expanded in particular sections of the article. -Wikid77 (talk) 15:12, 17 October 2008 (UTC)

Am I missing something?

[...] a CD player draws a constant current of 200mA from two rechargeable AA batteries that have a capacity of 2300mAh each. So, 2.300Ah / 0.200A = approximately 11.5 Hours of battery life.

I am not well versed on electricity, but if we are talking about 2 batteries with a capacity of 2300mAh each, wouldn't that bring the total amount of capacity to 4600mAh? The CD Player on that example would then last 23 hours... --CronoT 15:31, 20 December 2006 (UTC)

The batteries are connected in series, giving a total voltage of 3 V with a capacity of 2300 mAh. The same current flows through both batteries. Would they be connected in parallel, the voltage would be 1,5 V, with a total capacity of 4600 mAh. LHOON 15:39, 20 December 2006 (UTC)

Heh, that was fast! :-) Thanks for the clarification. Maybe this should be clarified on the article as well, for the sake of newbies like me. --CronoT 16:56, 20 December 2006 (UTC)

Done. LHOON

Topics from 2007

SI

Which is the SI metric equivalent ?. --Nopetro 21:48, 21 May 2007 (UTC)

Since 1960 it would be Ampere-hours. http://en.wikipedia.org/wiki/Coulomb#Historical_note Memobug (talk) 23:53, 2 August 2008 (UTC)

Why don't they use Coulombs to tell battery capacity? I think the current usage is as dumb as telling distances in knot-hours, even if all are correct. Alvaro --212.81.220.70 (talk) 14:13, 24 November 2008 (UTC)

Topics from 2008

Retrofit topic year headers

17-Oct-2008: I have added subheaders above as "Topics from 2006" (etc.) to emphasize the dates of topics in the talk-page. Older topics might still apply, but using the year headers helps to focus on more current issues as well. Afterward, I retro-dated/named the unsigned comments. -Wikid77 (talk) 15:12, 17 October 2008 (UTC)

Redirection titles

17-Oct-2008: Beyond title "Ampere-hour" the following terms also link to the article as redirection titles:

• amp-hour, Ah, mAh, A/h, A/H, milliampere-hour,
• milliamp-hour, milliampere-second, milliamp-second, mAs.

There might be other associated titles as well; however, they should only be defined as redirection-titles in Wikipedia if commonly used. Otherwise, users can run a wiki-search for any term to find any related wiki articles which contain/define that term. There is no need to define a wiki-name for every term which could be found by searching. -Wikid77 (talk) 15:12, 17 October 2008 (UTC)

thank you, editors of these science articles!

it helped me sooo much in my schoolwork, i know i forgot 2 log on but who cares, andyway, thank the editors who did all the nerdy scientific contributions!!! you saved my life and it's certainly better than my science teacher's boring lessons 78.105.31.170 (talk) 17:35, 23 October 2008 (UTC)

[ah] is an abrevyasion for ampere hour witch is E=QV witch i have no idia what it is! when you tern on the lights the light bulb can get up to 2,200 degrease c. also when a light bulb lights up the fliliments in the adums start vibrating and they heat up during that proses. —Preceding unsigned comment added by 65.117.213.17 (talk) 01:01, 28 February 2009 (UTC)

Power? Energy?

Twinkle twinkle little star, power equals $I^{2}R$.... My concept of a battery is something that stores energy, not electrons. How is mAh a useful measure of a battery? I suppose I can multiply by the voltage (assuming a constant voltage) and get that a 1,000 mAh battery at 1.5 V is 5400 joules or 1.3 kcal... But (a) that sounds like too much energy (over a half a day's food in one AAA battery!?) and (b) Why don't battery manufacturers talk in units of energy? Or is there something about the chemistry of batteries that makes this more meaningful (like rocket engineers using specific impulse)? —Ben FrantzDale (talk) 01:20, 8 October 2009 (UTC)

Redirects

If you type mAh on the address bar you get to MAh, which gets you to Ampere-hour.

What i'd like to address is that lowercase makes a real big difference in electricity, and so the redirect should not actually happen.