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I have a table that i am trying to wire with LED strips, i want it to be run off battery power and i have 2 9v batteries. the LED strips need a 12 volt supply. so i figured that i can hook up the 9v batteries in series to give me an 18v power source, but now i need to know how big of a resistor to use to drop it down 6 volts to get my desired 12 volts.
And got the following answer:
As far as I can tell you'll need to know the resistance of the LED strip to find the resistance you need the resistor to be (by my work the resistor needs to have half the resistance of the LED strip). If you know anything else about the strip (such as power), you should be able to find its resistance. Hope you're able to work this out!