Headlamp Section: Description: The headlamp works by going through a step by step process making it, re-making it, and checking it to see if it works. A circuit is a movement that starts and finishes at the same place. This circuit works by connecting all of the wires together make a full circuit. Once it’s a full circuit it will go in a circle/pattern continually. The lights are in parallel because it’s a parallel circuit. The switch is in series because it can switch between the parallel circuit. There are 1.5 Volts and I got that by looking up how many Volts there are. The connections are made by soldering it together. An LED is a light switch that we use to see when it’s dark. A regular bulb won’t work because it’s bigger than an LED bulb. It won’t light as well. A resistor is a device to the passage of an electric current. It is used to make a current go threw all of the circuits. They are necessary because it puts the entire headlamp together and make it work.