A mA, or milliamp, is 1/1000th of an amp, a measure of the flow of electrical current. It helps to think of electricity as water flowing down a pipe - the voltage is like the water pressure, the current (mA) is the amount of water flowing, and the resistance is the width of the pipe. Too much voltage can burn out your electronics, just like too much water pressure can burst your pipes. But you can safely use a supply with a higher mA rating than you need, it just means you have more water on tap if it's needed!
Last edited by dannybuoy : 05-14-2010 at 06:36 PM.