The picture demonstrates the extermal of an light emmiting diode flashlight and explain how it funtions
Overall, it can be seen that the LED has two batteries and a switch to regulate. The light depens on the switch.
In outside, the LED comprises a bulb, switch button and a plastic case. Inside, there are two batteries were connected by a ball, the battery above connect with bulb to provide light. At the bottom, the others battery was linked with metal spring and the flow to activate the metal switch contacts.
To the side of the batteries is a slide switch, which contains a broken circuit and a metal contacts. When light is needeed, the switch is slide upward, while in “off” position, the circuit is broken because the contact do not touch.
