For this project we learned how a circuit works. Just to make the headlamps we had to learn about electricity, wires, batteries, and etc for 2 weeks. We had to solder the wires to the circuit board, hook it up to the battery holder and solder the the wires to the LED lights. After we put batteries in to test it to see if it worked or not.
The way that the headlamp works is the LED's are connected to the circuit bored which one side is connected to the resistor and the other is connected directly to wire. The resistor is connected to the other wire. The two wires are connected to the positive and negative parts of the battery pack which provides electricity that runs through both wires giving the LED's power and light appears.