But I've seen this i.e in a device I saw that a red color light emitting LED was connected to a resistor and it was working fine. Then why can't a white color emitting LED do that same. I have a resistor and I tried this experiment but the LED was giving very small amount of light as compared to...
In my home I am getting 220 AC Volts of electricity. I want to connect white color Light Emitting Diod (LED) that requires 3 volts output with the resistor which will be connected to 220 Volts power. So can anybody please tell me what is the formula to find that how much voltage is output from a...