Hi, I need to divide my voltage on a power supply. If I have a 3.4v out put and a 5v out put what resistors do I need to halve these two? Thanks in advance.
Divide the voltage to achieve what? You can use a wide resistance range as long as the divider output is unloaded. But the load resistance becomes part of the divider, respectively the load current causes a voltage drop according to the divider output resistance.
Which load shall be connected to the voltage divider?
I need to halve the voltage of the 3.4v out put and the 5 v out put to run a single cell electrolyzer. Optimum voltage for a single cell is between 1.7 and 2.2 volts. It asks about 20 amps.
Quite simple, it's impossible with a voltage divider. A series connected variable power resistor (rheostat) could be used. These days variable constant current switch mode power supplies are used for electrolysis.
if you do a little searching at digikey, or mouser, or newark,
you will probably find an appropriate switching power supply for a for less than the cost of one 200 W resistor
it will also not get as hot, will not waste as much energy, and will take up less space.