sdh2903
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| posted on 3/4/13 at 03:09 PM |
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led trailer indicator load resistors
Hi all
just finishing off my trailer build and I was hoping the tintop would cope with the led indicators, but it can't. I accept the fact an
electronic relay is the best solution but If I want to use the trailer with a different car then it's going to be a hassle, can anyone suggest
some load resistors that work? there are loads on eBay but with all different ratings
cheers
Steve
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britishtrident
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| posted on 3/4/13 at 03:23 PM |
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P=VI re-arranging I = P/V for a 21 watt 12v bulb actual current = 21/14 = 1.5 amps
V=IR re-arranging R =V/I in this case 14/1.5 which gives a resistance of approx 0 .9 ohms
As the LED wiill take some current a 1.0 ohm 25 watt resistor should do the job, but a 1.0 ohm 50 watt resistor would be better
The dummy load resistor goes in parallel with the LED
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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rx7locost
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| posted on 3/4/13 at 03:43 PM |
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quote:
V=IR re-arranging R =V/I in this case 14/1.5 which gives a resistance of approx 0 .9 ohms
Ummmmm 14volts/1.5Amps = 9.33 ohms on my calculator.
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gremlin1234
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| posted on 3/4/13 at 04:46 PM |
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the very simplest (cheep, easily available, ) resistors are: 21w12v bulbs themselves
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britishtrident
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| posted on 3/4/13 at 04:54 PM |
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quote:
Originally posted by rx7locost
quote:
V=IR re-arranging R =V/I in this case 14/1.5 which gives a resistance of approx 0 .9 ohms
Ummmmm 14volts/1.5Amps = 9.33 ohms on my calculator.
Thats what the "approx" was for.................................
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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gremlin1234
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| posted on 3/4/13 at 07:03 PM |
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quote:
Originally posted by britishtrident
quote:
Originally posted by rx7locost
quote:
V=IR re-arranging R =V/I in this case 14/1.5 which gives a resistance of approx 0 .9 ohms
Ummmmm 14volts/1.5Amps = 9.33 ohms on my calculator.
Thats what the "approx" was for.................................
approx, an order of magnitude...
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sdh2903
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| posted on 3/4/13 at 09:20 PM |
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cheers guys got some sorted from a very helpful gentleman on eBay.
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