I just obtained an Arduino Uno and was trying to work through some of the tutorials to become more familiar in using it.
However, I ran into a problem in that I went to go buy some of the components, and the folks at the electronics store wanted to know the wattage. For example, Blink ( http://arduino.cc/en/Tutorial/Blink
) requires a 220 ohm resistor, but the store sells 1/2 watt 220 ohm resistors, 1/4 watt 220 ohm resistors, and so on.
So how do I determine the needed wattage for the resistors, potentiometers, et cetera?