Amp Battery
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what resistor amount (in ohms) is needed for a 3.5 V LED to connect to a 12volt, 10 amp battery?
I am connecting the LEDs in parallel and will have one resistor for each LED. What size resistors do I need?
Depends on the current you want through the LED. What is the current spec?
If it is 20 ma, or 0.02 amps, then R = (12–3.5) / 0.02 = 425 ohms. (0.17 watt)
If it is 50 ma, or 0.05 amps, then R = (12–3.5) / 0.05 = 170 ohms. (0.4 watt)
If it is 100 ma, or 0.1 amps, then R = (12–3.5) / 0.1 = 85 ohms. (0.8 watt)
for reliability, double the power rating.
You Can save power by putting 2 or 3 in series.
Using that same 20 mA, 2 in series is 7 volts and needs a (12–7) / 0.02 = 250 ohms.
Using that same 20 mA, 3 in series is 10.5 volts and needs a (12–10.5) / 0.02 = 75 ohms.
The example with 3 in series is a bit marginal, as the small voltage across the resistor doesn't give you much protection.
PS, I hope you are not actually wiring them in parallel? Each should have it's own resistor, then the series sets of R and LED are wired in parallel.
.
Using Amp CrimpAce crimp tool for battery terminals.
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