Power over Resistors

2 replies [Last post]
Joined: May 10 2005
Posts: 1

Okay, I've been Googling for an hour now and not finding what I'm looking for, so obviously I'm asking the wrong questions. Here's my situation:

I have a miniature camera that runs off of a 9v battery for ~24 hours. I would like to extend that running time, and I have the space in my enclosure for additional 9v batteries. However, I cannot find a website that details the laws of physics when dealing with power supplies in series or parallel (since I'd rather not fry my camera with too much power). There are plenty of websites that talk about how resistors act when in series or parallel, but what are the actual formulas for power supplies in series or parallel? Or is that not the right term when it's referring to power supplies, since I can't find any websites that way. Anyone have any good resources for me?

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coius's picture
Joined: Aug 25 2004
Posts: 1975
let's see if i can recall...

you should be able to put the batteries in parallel. generally, if the voltage goes outside the required area, it could fry it. IIRC, having the extra amperage, just means there is more in the "pool" of electricity to pull from. Voltage is usually the "strength" of it going through the system


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martakz's picture
Joined: Dec 20 2003
Posts: 634
Your correct Coius. You can

Your correct Coius. You can connect as many 9V batteries in parrelel as you want, the voltage won't increase, only the total amount of energy stored.

You can also get funky switch mode boosting regulators which boost the terminal p.d. as the battery voltage drops.

If using a large number of cells you might wan't to add a small fuse incase of a short, in-order to avoid meltdown / pop.


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