Hello Lucifer22334,
Let me answer your power supply questions.
I have seen this many times that people do not
understand power supply ratings.
There are, basically, two types of DC power supplies:
regulated and unregulated.
The unregulated type is the simplest kind:
A rating of, let's say, 5 volts at 1 Amp means
exactly that. You can expect that you will
measure 5 volts at its output terminals when
it is delivering 1 Amp to a load. However, if
there is no load on that supply, there is no
voltage drop in its wires, so the terminal
voltage will be higher than 5 volts. That means
that the output voltage will change according
to how much current it is delivering to a load. How
much 'extra' voltage there will be is dependent upon
the quality of the unit.
The regulated type of 5 volt at 1 Amp supply is more
complicated:
It has circuitry that works to keep the output voltage
constant, and corrects that according to the load current.
With no load, its output terminal voltage will be 5 volts.
(That is the easy way to tell is the supply is regulated.)
With a 1 Amp load, its terminal voltage will be very close
to 5 volts. So, the output of a regulated supply remains
quite constant while the load changes.
That having been stated, you can understand that a power
supply delivers a terminal voltage but the current it supplies
depends on what is connected to it as a load. A 1 Amp supply
can not deliver that current into a load that does not require
it. Ohm's law holds here, too, The output current is: terminal
voltage divided by the load resistance. No load, no current.
If you have another question, just ask it.
Herb