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For about $5 you can purchase a commercial laptop power brick on Ebay that will give you a solid 12+ Volts at a decent Amp load...
As for the rest of you comment about a load resistor, what exactly are you trying to do?
I am making a 12 volt power supply for my rc lipo charger. I need to get a solid 12v or above for the charger. i am using a load resistor connected to 5v and ground. what would be the best resistor to use. how high can i go. 10ohm 10 watt.
i am making a power supply from my old computer. It is 12v 25 amp so i can power my lipo charger.
Ah, no. He needs to place a load on the 5V rail to make it regulate the 12V rail.
Some (PC) power supplies don't need this, I assume the OP has checked and found his does.
I would say 10 ohm 5 watt should be fine, but get two just in case you need a greater load. If you do, place them in parallel.
For approximately $5 you can get an advert mobile computer strength packet about Ebay that will offer you a strong 12+ V in a reasonable Amplifier weight...
Are you aware that all anyone opinion of a insert resistor, precisely what are an individual wanting to accomplish?
I would stick with the two 10W 10R resistors.
Then check the 12V rail under load (is it rated for up to 30A?)
If it droops, try adding additional 10W 10R resistors in parallel. a 1 ohm resistor would be dissipating 25W, and I would recommend a 50W resistor for this. But that load is way too high.
Stick to what I suggested (even 1 of the 10R resistors may be OK)