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Old 08-02-05   #11 (permalink)
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you dont need a power supply other than the battery in the multimeter

OHMS = VOLTS/AMPS

it if emits 9 volts and the resistor is taking 0.03 amps, then the resistance is 270 ohms
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Old 08-02-05   #12 (permalink)
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Quote:
Originally Posted by rustler753
Well You are just using your voltmeter right, well can it supply a 12v current through that resistor? I would think you would need to solder it to a 12v source to get any resistance readings out of a voltmeter?
you dont need a power supply other than the battery in the multimeter

OHMS = VOLTS/AMPS

it if emits 9 volts and the resistor is taking 0.03 amps, then the resistance is 270 ohms
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Old 08-02-05   #13 (permalink)
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good on ya...rep 4 u ....

What he said ^^^
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Old 08-02-05   #14 (permalink)
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hmm by the looks of ur LEDs, they may be those ones that can be used anywhere, to indicate wheather there's power or not...

try to connect one of them (the one u hate the most, cuz if it breaks there's not worry)
to a battery, see what happens
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Old 08-02-05   #15 (permalink)
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Quote:
Originally Posted by somody
you dont need a power supply other than the battery in the multimeter

OHMS = VOLTS/AMPS

it if emits 9 volts and the resistor is taking 0.03 amps, then the resistance is 270 ohms
So what is going on with these freakin resistors?? wrong ones?
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Old 08-02-05   #16 (permalink)
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470K ohm?!?!?!!?!??!
ahhhhh i use 100ohm for 5v... so 12v will not need 470K for sure
try to return them
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Old 08-02-05   #17 (permalink)
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so what do I need 470ohm not 470k ohm? just a slight difference of 469,530 ohms!
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Old 08-02-05   #18 (permalink)
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Quote:
Originally Posted by RSThrilla
470K ohm?!?!?!!?!??!
ahhhhh i use 100ohm for 5v... so 12v wont be so much

try to return them
wrong...if you use 100 ohm for 5v, that means that 0.05 amps are going through

(V=IR; I=V/R; I=5/100; I=0.05)

so, for 12 volts, and the same current (0.05 amps), the resistance in ohms is 240

(V=IR; R=V/I; R=12/0.05; R=240)
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Old 08-03-05   #19 (permalink)
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Quote:
Originally Posted by fstfrddy
so what do I need 470ohm not 470k ohm? just a slight difference of 469,530 ohms!
lmao

And you're wondering why they don't light up...

Quote:
wrong...if you use 100 ohm for 5v, that means that 0.05 amps are going through

(V=IR; I=V/R; I=5/100; I=0.05)

so, for 12 volts, and the same current (0.05 amps), the resistance in ohms is 240

(V=IR; R=V/I; R=12/0.05; R=240)
No, you have to take resistance of the LED into account, see FAQage in siggage.
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Old 08-03-05   #20 (permalink)
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you should need 84ohm i think im pretty sure thets what the led guide said
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