Lets say we have a 3.7V power source(Vs) and a blue XP-E2 cree LED with a Foward Voltage(Vf) of 3.4 and current of 1Amp.
Using Ohm's law[R=(Vs-Vf)/I] we have
.3 = (3.7-3.4)/1
So the best resistor available in TCSS is the .47ohm/.5W resistor
If we use the mentioned resistor are we able to calculate the actual current that the LED will get?
Using Ohm's Law again (I=V/R)
Current = Voltage/Resistance
I = V/R
3.7/.47 =~ 7.9
So current is 7.9? that doesn't make sense. Would someone be able to explain this and show how to calculate the actual current?
One more question:
If we have a 3.4V power source we can plug it directly to the LED and the current flow would be 1A correct?
So if the power source is 3.7 instead, what current would the LED draw? Would it be proportional?
3.4V*1.1=~3.7V
1A*1.1 = 1100mA
Is that right?
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