Dumb DC electricity question

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mb82

223 posts

Master Geek

#220325 6-Aug-2017 13:58

What would happen in the circuit above the blue line?

What would happen in the circuit below the blue line?

Basically want to connect a 9v battery directly to my car radio 'constant 12v' and 'ground' wires so I don't need the reset code when I disconnect the battery and can't get my head around whether it will blow up or not.

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Rikkitic

Awrrr
18659 posts

Uber Geek

Lifetime subscriber

#1839859 6-Aug-2017 14:16

If you are lucky, you will only destroy the 9 volt battery. If you are not, there will be an explosion and you will destroy your car.

In both circuits the 12 volt battery will try to discharge through the 9 volt one because of the difference in potential. The 9 volt one won't like this at all.

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