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mamun2a said:Whhat happen if i use 3 White LED series with 12 vdc, is it consume more current than parallel??
mamun2a said:dr do ask for resistor in every LED?? do u mean that LED consume more current in parallal connection. if so why maximum lowvolt Led flash light use LED in parallal connection, because it reduce battery life faster. confused??!!!
RODALCO said:Power depends upon if you run a single LED wirh correct resistor from 12 Volts, or 3 LED's in series from 12 Volts with a series R.
1. If you put 3 single LED's drawing 20 mA each, with their own resistor on the 12 Volts supply the power usage will be higher.
2. Put the 3 LED's in series, drawing 20 mA with a single dropping resistor, usage will be lower.
In the first case each resistor will have to dissipate about 8 to 9 volts at 20 mA in heat. (taken 3½ to 4 volts per white LED)
In the second case the LED's consume about 10.5 volts and the series resistor only has to dissipate about 1.5 - 2 volts at 20 mA's.