a question i need answere on. im not really good on electronic stuff regarding resistors and dc current and that jazz. but im installing some spotlights the transformer needs 2 spotlights at minimum to work properly, max 6 spotlights. maximum wattage shoul

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File: 1416497848037.jpg (378.97 KB, 1920x1200, 8:5, 6.jpg)

Anonymous 11/20/14 (Thu) 15:37:28 No.115

a question i need answere on. im not really good on electronic stuff regarding resistors and dc current and that jazz. but im installing some spotlights the transformer needs 2 spotlights at minimum to work properly, max 6 spotlights. maximum wattage should not exceed 15w and no lower than 4.5w. but im only going to use 1 spotlight. the voltage output from the transformer is 52v. so if i have done my math properly a a 100ohm resistor which i have should help it work properly. but how do i tell if the resistor will hold for the power of the circuit?

Anonymous 11/20/14 (Thu) 17:47:17 No.116

File: 1416505637772.jpg (41.27 KB, 838x946, 419:473, 1355944593820.jpg)

>but im installing some spotlights the transformer needs 2 spotlights at minimum to work properly
>but im only going to use 1 spotlight
well that sounds like trouble to me

i cant think of any logical reason why there would be a 2 spotlight minimum, are the spotlights connected in series or parallel?
plug it in and see if it goes bang

Also this really isnt ham radio

Anonymous 11/20/14 (Thu) 18:29:57 No.119

>>116
yea, i know, but it said Electronics in board title so. they are connected in series it is 230v ac in 52v dc out to a connection hup with 6 sockets in series for the spotlights. when i use one spotlight it only flickers, really wierd.

Anonymous 11/20/14 (Thu) 18:30:46 No.120

>>119
>hup
hub*

Anonymous 11/20/14 (Thu) 19:21:09 No.121

>>119
What wattage are each spotlight?

Anonymous 11/21/14 (Fri) 04:08:22 No.122

>>121
doesn't say. but since the min load is equivelnent to 4.5w in the circuit the total resistance would be 600ohm (52^2/4,5=600), which should mean the resistance of each light is 100 ohm, and 100ohm resistor would simulate another lamp?

Anonymous 11/21/14 (Fri) 05:30:45 No.124

File: 1416547845348.jpg (30.19 KB, 600x300, 2:1, spotlight.jpg)

>>122
I would try just using one light. If it works and the transformer doesn't get too warm, great.

Maybe a fan could be used to cool it?

If you use a 100 ohm resistor you have to make sure it is rated for that amount of power(There will be a lot of heat).

You could make your own wire wound one using nichrome wire.
Using 100 feet of 60 gauge nichrome wire(25$) with a resistance of about 1 ohm a foot. Wind it around a coffee can or something to dissipate the heat.

Measure the resistance of a household ceramic heater. It will likely be around the resistance you are looking for and be capable of dissipating the heat.

Anonymous 11/21/14 (Fri) 09:07:34 No.126

>>124
when using only one the spotlight flashes continuously. i just found out the watt of the lamp is 2.5, so 52^2/2.5=1080~. that whould mean i need a 1080ohm resistor, so now im a little confused.

Anonymous 11/21/14 (Fri) 20:17:41 No.127

>>126
I've got no clue, the lights shouldnt do that. Anyway, its nothing to do with this board…

Anonymous 11/22/14 (Sat) 01:09:29 No.129

>>126
That shouldn't happen. Not enough information has been given to diagnose the problem.