For my object deconstruction project I chose a cheap flashlight to dismantle. I thought this would be fun to see how a very cheaply made item was built so small. Below you can see all the pieces dismantled. It was composed of: a flashlight body, a screw-on lens, a bowl-shaped piece to focus the light, a button to fit in the hole in the body, and the battery/led contraption.
In looking further into the only part that really does anything, we can see it is made up of 2 batteries (LR1130), a wire underneath, an LED, and a metal piece that acts as a sort of switch.
The wire runs from the positive side of the first battery, through the LED, around the other side of the plastic, and connects with the negative side of the other battery.
The current then runs through the battery, and into the metal piece (which is touching the positive side of the battery). This means, when the metal piece is pushed down and touches the negative side of the first battery, then the circuit is complete and the LED lights up.
Below is my best attempt at diagramming the circuit.