One more question.Trying to apply my new knowledge. Just supposing, and NO I'm not going to do this, power outlet...120V to LED(30mA, 3v).120V-3V = 117V117V/.030 = 3900OhmI was thinking about WHY this might not work and then I asked, How many Watts can the Resistor handle?Watts = Current x Volts..03Amps * 120 = 3.6 Watts.SOOOO... could I 4 watt 3.9KOhm resistor run this LED from the wall?
Your math is correct.Reverse voltage is how much voltage can be held off before the LED may be damaged when it should be off.A diode conducts current when a forward voltage is applied, but will not conduct if a reverse voltage is applied, up to a point. Reverse voltages in excess of the maximum can cause the diode to fail.http://led.linear1.org/what-are-the-electrical-characteristics-of-leds/If the max reverse voltage is 5v and you using a 9V source, pay attention when hooking things up.
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