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Complete & Utter Member
Ok Smarty Pants ...... See if yas can answer these :D
Dropping resistor calc
Voltage Supply = 12
Current required = 0.17a
Resistor value = 56 Ohm
Forward voltage = ??????
Voltage Supply = 12
Current required = 0.17a
Resistor value = 68 Ohm
Forward voltage = ??????
I'm wayyyyy to dim to do these
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Senior Member
AC single phase, 3-phase or DC?
Cable length, type and size???
...no bridgekeeper will launch me into the abyss I tells ya!!!
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Complete & Utter Member
Woo DC sorry
Cable umm 0.5 mm Sq bout 150 mm long
Last edited by j.m@talk; 03-19-2007 at 10:10 AM.
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Senior Member
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Senior Member
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Complete & Utter Member
Umm .......... Bit low that ......... Looks like I'm gonna have to buy some ............ I'll go on the net & use a handy tool to specify what I want
Cheers anywho
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Member
Good ole Ohm's law :-)
E=I*R, I=E/R, R=E/I where:
E = "Eloctromotive Force", "Voltage", "Differential Pressure."
I = "Amperage", "Amps", "Current."
R = "Resistance", "Ohms", "Opposition to flow."
There is also the "Power Formula" - the difference being that Ohm's Law (A resistance formula) can not contain "P" = "Power", "Watts", "Wattage." And the "Power Formula" (A power formula) can not contain "R" = "Resistance", "Ohms", "Oppostion to flow."
Power Formula
P=I*E, I=P/E, E=P/I where:
P= "Watts", "Wattage", "Power."
Cheers.
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Complete & Utter Member
Well thats just plain odd .........
I gotta ATX psu out to test this ......... linked the green to a black to fire up the unit & connected one end of the resistor to a yellow & ran it back through a multimeter .......... 12.2v....... Ehh ? ....... Took the resistor outta circuit 12.2v WTF ? ....... Clicked over to ohms ..... (2000) 56ohm Ummmmmmm ........ Gotta 510 Ohm resistor out ....... 12.2v ......... Connected a LED to it ...... It lit up fine didn't just burn out. ....... Me finks my meter is having issues
Mind you it read 238vac ok off the mains supply ....... Freakin' wiered
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Guest
The answer it lbbowing in the wind of my rectum
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