Re: 9V Battery Current
From: Robert Baer (robertbaer_at_earthlink.net)
Date: 08/19/04
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Date: Thu, 19 Aug 2004 06:34:20 GMT
John Larkin wrote:
>
> On 17 Aug 2004 23:11:39 -0700, chad.waldman@mail.com (Chad Waldman)
> wrote:
>
> >I posted a message a week back but never received the answer I was
> >looking for.
> >
> >I have an electromagnet hooked-up to a 9V battery. The magnet is
> >strongest when the battery is at full charge. I want to replace the
> >battery with an adapter to run the magnet from an outlet. What I am
> >wondering is, what is the max current the battery is outputting when it
> >is new? If you have an ammeter, can you please test the output of a new
> >battery.
> >
> >Thank you,
> >Chad
>
> RatShack 9v alkaline, I got 6 amps into a dead-short ammeter for the
> first second or so, and then it dropped rapidly. After about a minute,
> it was down to 1 amp and the battery was getting pretty hot, so I
> quit. A rechargable would likely behave differently.
>
> We'd have to know the magnet's resistance to estimate the actual
> current. How long does the battery last, by your standards?
>
> You should probably buy a cheap DVM and measure actual coil resistance
> and the voltage that makes it work OK.
>
> John
The short circuit current of the battery is not relevant, period.
In fact, it is *stupid* to make such a useless measurement.
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