what is a LED?

Life of one led is 100000 hours. LED is a tiny little bulb. PIZZA LED SIGN

A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n junction. LED is a tiny little bulb. This effect is a form of electroluminescence. With help of LEDs you can make Led sign boards and LED Clocks to make your shops attractive. We can use LEDs as indicators in electronics devices, say for ON ,led glows and for OFF it doesn't. Life of one led is 100000 hours. The color of the emitted light depends on the condition of the semi conducting material used, and can be infrared, visible, or near-ultraviolet.

Calculation of LED resistor Value: We must put a resistor in series to obstruct the current to avoid burn out. According to Ohms Law V=IR or R=V/I, In our case

V=V_Supply - V_LED

Therefore the resistor value, R is given by:

R = (V_Supply - V_LED) / I

V_Supply = supply voltage, V_LED = LED voltage, I = current of LED

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