Question about amps with same volts. - RC Groups
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Aug 06, 2005, 11:32 AM
Yep I got another one.
mohillbilly's Avatar

Question about amps with same volts.

Ok sorry not exactly plane related but I need help.

ok so I have something that runs off a 115ac plug and converts it to 12VDC @ 500mah, can I cut the plug and say run it off a car battery? its 12V but huge amps of cource. with it only draw what it needs or will it go up in smoke? thanks for any help.
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Aug 06, 2005, 11:59 AM
Space Coast USA
hoppy's Avatar
What kind of item are we talking about?

It seems that it would no different then a 12V charger that you plug into a power supply? You can run it from the 12V battery or the 12V power supply. The circuitry of the device determines the current draw.

In your case, you just make sure that your battery can deliver 500ma. (Not mah)

Make sense?

(These ramblings are not to be considered reasonable or sane advice)
Aug 06, 2005, 01:37 PM
Registered User
Should work OK but make sure you use a Radio Shack inline blade or glass type fuse holder with a fuse of around 1 - 2 amps, situated close as possible to the battery. Just in case you accidently short the wires to the eqipment.

Aug 06, 2005, 01:48 PM
Yep I got another one.
mohillbilly's Avatar
Cool thats what I thought, Basicly I'm taking something that runs off a 12V / 500ma power supply, and willbe running off my car battery. 12V / lots of amps. I always use a fuse for stuff like this or I just run the wire from the fuse box.

Aug 06, 2005, 01:58 PM
Registered User
Just double check to make sure you have the + and - wires connected right.


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