As complicated as modern electrical wizardry seems, it all boils down to three things: voltage, resistance and current. Don’t panic! It really is that simple, so hang in there and we’ll get to string lights together before you know it. To put it in the simplest terms: voltage is how much energy your electric circuit has. Resistance is how easily your circuit will let that energy flow. And current is how much energy is able to move through the circuit. Think about water for a minute: if water flows from an elevated tank into your house, the size of the pipe is like resistance. A small pipe will only let a small amount of water through, so the resistance to water flowing is high. A large pipe will let a lot of water through, so resistance to water flowing into your house is low.