# 12v converter and amps

Discussion in 'The Projects Forum' started by mikefree, Mar 1, 2014.

1. ### mikefree Thread Starter New Member

Mar 1, 2014
1
0
Hi. I know zip about electrical (as you can tell from the questions) so if you have an answer please speak in grade 9 english...and talk slowly

1) What is the difference between the big (ish)110v to 12v converter from canadian tire for 50 bucks and the much smaller 1 dollar one from ebay? Isnt every ipod and phone charger a 110 to 12v or 5v converter and they are tiny and cheap like the ones on ebay. I have a tone of them around the house as well from old toys etc that say input 110v and output 12v. I looking to power some leds for home power and maybe a case fan.

2) Amps. if the led appliance uses 2A but the converter puts out 14a will it damage the appliance or does that work the other way around.

2. ### MrChips Moderator

Oct 2, 2009
12,642
3,457
The fundamental Ohm's Law applies which states that I = V/R,

the current I through a resistor is proportional to the voltage V applied across the resistor and inversely proportional to the resistance R.

This means that the load is going to demand as much current as it needs based on its resistance.