I want to supply some LED's and a motor from an outside source of electricity (i.e. a battery pack, wall outlet, batteries in series, etc.) and want to use the Arduino to be able to "switch" on and off these sources so that I am able to control long strands of LED's with the Arduino (for like a steam punk costume for example and stuff), how would I do that? Would I use a logic gate, if so, I'm pretty new to circuits, how would I use it? What amps, or voltage or what I am so confused Or is there something way easier like electric switches or something?