Some questions on how to wire relays

Question

So right now I'm working on a project where I have 3 rope lights that run on wall power and I want to control them individually with my arduino.

The problem I am having is I am not sure what value relay and/or transistor I should use to control it, or how to wire the circuit.

Any suggestions?

R_Phoenix · Answer

First you will need to know the amp draw of the rope light. See if you can find a rating for it, maybe in "amps per foot". If not, you should be able to messure the amp draw with a meter. BUt if it is 110volt I would suspect it's only an Amp or 2 at the most (depending how long it is). this should work; http://www.robotshop.com/seeedstudio-arduino-relay-shield.html