March 17, 2010
I'm pretty bad with electronics... I'm more about putting things together I guess. But I need a little help:
I don't understand how a power source (battery) has amps. Isn't current (amps) a function of voltage and resistance through ohm's law? Is it possible to blow something with too many amps like it is with volts?
While we're at it, what happens when you put a voltmeter behind a resistor? Where does that number come from?
Also, let's say I tried to power (among other things) a picaxe with a 12v 8 amp computer power supply. Could I get it down to the 5 volts required with resistors? I know I can use a 5v regulator, but I don't want to waste a lot of power to heat. Would the amps be to much for the picaxe?
edit: alright, apparently power supplies usually have a 5v output. still, will this give two many amps for a picaxe?