How can I power four devices each having different working amperages?

I want to power four devices with different working amperages.

• 1st device: 0.015A, 12V
• 2nd device: 1A, 12V
• 3rd device: 1A, 12V
• 4th device: 3.5A, 12V

Power supply: DC 12V 6A Power adapter

I'd connect all four of them to power source in parallel, to make the voltage stay the same in each branch (correct me if I'm wrong)

Would a power supply with an output of 6A be enough to properly power them all? Because 1A+1A+3.5A+0.015A=5.515A≈6A= Output of the power supply (Is that correct?)

So how can I provide different amperages to devices with single power supply? Here is a simple scheme if it helps:

• I don't get what you really want. You connect them in parallel, established that the amperage of the psu is enough, what else do you need? Commented Mar 23, 2018 at 16:18
• As long as some of them or the biggest does not have a start surge > current limit then it wont shut down. But generally you have to derate max current to run cool or allow for start surges Commented Mar 23, 2018 at 16:18
• You are correct, the voltage is regulated to 12v and the current draw by all devices combined is less than the supply can provide. The only thin you need to consider is whether the devices draw more power on startup ...this could be because of a motor within a device or even just large filter capacitors in a device. Commented Mar 23, 2018 at 16:18
• PlasmaHH What I don't get is how these four devices will draw the current out of the power supply. Will they just draw the amount of current that they need or will the power supply itself just spread the current across all four branches however "it wants". I know that I=V/R, but what I don't know is what will the resistance of each branch be. Excuse my newbieness, but I don't think it would be good to use R=V/I formula on this one. I hope you now understand what I want. Commented Mar 23, 2018 at 16:32