Diode is an electronic semiconductor device can flow a current in one direction only. Light-emitting diode (LED) is a device that lights up when a current is passed through it in the right direction. Early LED was low intensity, the red LED light alone is available today, that release of light through the visible spectrum. Therefore, they can be used for various purposes. In order to have control of when the LED is lit, you need to connect to the switch.
LED that you have purchased, please be aware of the rated voltage and current.
You calculate the value of the resistor required for the circuit in accordance with the formula (voltage source - the voltage drop of the LED) / LED current of amps = ohms. For example, using a 12 volt power source with an LED rated at 3.1 volts and 20 milliamps results in a resistor value of 445 ohms. As much as possible rounding, buy a resistor with a value close to this value.
The resistance to the LED of the positive lead soldered, this is called the anode, and the length of the two wires coming out of the LED.
Make sure that the switch is set to the "OFF" position. With a piece of copper wire to connect the other end of the resistor to one terminal of the switch. Solder the wires to the switch and resistor.
The part of the copper wire solder between the other terminal of the positive side of the switch and the power; the supply side, are marked by "+", and, as a rule, are red commercial power supply terminal.
Wire between the negative side of the LED, and put the third piece of the force, the negative side is referred to as the cathode, two wires, will be shorter than coming out of the LED. Solder the wire to the LED and the power supply.
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