Bench Power Supply - Settings f0r Arduino

Hi Everyone. I’m fairly new to electronics but slowly picking up the basics. Here’s my dumb question for today 😀

I have a DC bench power supply 30V/5A which has variable voltage and current presets (5 or 6 memory buttons). When using with say 3.3v, 5v, 9v, 12v etc, to power an Arduino project or external board, what should the current limit be set at for each voltage? I know this depends on the load, as voltage will drop with a higher load. I feel the answer should be obvious, but need to get my head around this part of Ohm’s law!

Don’t want to fry my components.

Thanks folks, stay safe.