The diagram illustrates the design and the working mechanism of a LED flashlight
Overall, the LED flashlight consists of three main parts; namely the switch system that controls the electric current, power supply and a protecting outer layer.
Regarding the structure, the entire device is fully enclosed in a plastic casing. Inside, two batteries are horizontally arranged, with one being on top of the other, serving the role of generating electricity for the flashlight. The negative terminal of the bottom batteries is directly connected to a metal spring which facilitates electric transmission. On the left side of the flashlight locates a slide switch to turn on and off the device.
Turning to the mechanism of the flashlight, it is operated by the aforementioned slide switch moving up and down, in which being pushed upward will turn on the flashlight and vice versa. In the “on” position, the metal switch contacts are connected, allowing the power from the batteries to flow through the circuit to reach the metal spring, eventually activating the LED light bulb at the front. On the contrary, when the circuit is broken, the electric current is prevented, resulting in the flashlight turning off.