Glow Led
How to glow single LED rom 220 volt supply with single resistance?
Assuming you want about 5ma for a common LED, a 47K ohm 2 watt resistor would be good. This assumes you are talking about a DC power source. For an AC power source you probably will want to add a second diode to keep the LED from going into reverse breakdown.
A white LED will have a voltage drop of about 4 volts, colored LEDs will be less.
R= 47K ohms = 47,000 ohms
The calculation (DC):
V=IR in volts-amps-ohms
R= V/I = 216/(0.005) = 43,200 (47K is a common value)
Power = P = VI = (216)(0.005) = 1.08 watts dissipated by resistor (2 watts is a common value)
ford ranger LED glow
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