What resistor should I use? 9 volt battery to a 3.6 volt @ 30 mA LED
What resistor should I use? I have a 9 volt battery that is connected to 30 LEDs in parallel and i need a resistor. the LEDs are blue and are at 3.6 volts with 30mA. Each LED is in parallel I want to put one resistor on the positive side of the battery before all the LEDs.What size resistor do you think i need? The two online calculator say i should use a 220 ohm at 1/2 watt but another one says I should us a 220 ohm at 1/4 watt resistor. WHat do you think I should use?