Will two 10ohm 10 watt resistor in (series and/or in parallel) increase or decrease load compared to one 10ohm 10w resistor?

With two, it should be 5ohm which is less resistance but more load but when they are together, is it 20w or 5w or still just 10w? And does more wattage add more load?

A single 10 ohm resistor on 5V results in 0.5 amp and 2.5 watt of power dissipation.

2 in parallel reduces resistance and increases load, 5 ohm, 1 amp, 5 watt.

2 in series increases resistance and reduces load, 20 ohm, 0.25 amp, 1.25 watt.

The 10 watt on the resistor is a maximum rating, the actual power dissipated depends on the voltage applied to the resistor. In both the series and parallel cases the 2 resistors have a combined 20 watt rating, but that will occur at different voltages depending on parallel/series hookup. As mentioned earlier if ran at full rating the resistor will get quite hot, best to run well below the maximum rating.

Cool! Makes sense with the calculations next to eachother like that!

So isn't it better to have two 10w10ohm resistors in parallel to have less heat than one 10w 5ohm resistor?

PC supplies are generally designed with the assumption of having load on them when turned on. Most recommend having the charger attached before turning on the PC supply.

I connected the battery banana's once I turned on the PS with the charger connected. Which it says to do in the manual so I thought I'd try it. Charger is a ok. Just did a storage discharge fine on the first 17a PC PSU. Obviously because it requires no power.

You are on the right track, that should reduce heat of each resistor.

Drat, reading is fundamental, you did mention output. My bad.

No luck, neither power supply is gonna work

Back to the drawing board...

Just bought this

http://www.ebay.com.au/itm/HP-DL380-...uhb=1#viTabs_0

Will be converting with this method

http://www.ultimaterc.com/forums/sho...d.php?t=174225

Thanks for all the help, will report back in a few days, hopefully it all works out and I can run my new 5S lipo.