Let there be light - Question

[dtd24]

Pretty much have it done as stated. Wow lights up my life. I will post some pics, I just have to tie up some loose ends on the install. It was stupid cold to day I did it, so I was unable to finish stuff like the wire loom and stuff. Suppose to warm up soon, says the dam groundhog.

DaveD

 

[SPIKER]

Mark I believe you have a typing error in your formula

P = I * E is correct

E= P/I Amps = 55watts/12volts you went on to do the math right I am assuming you meant to say that

I= P/E I (amps) = P (power) / E (volts) = Amps = 55 watts/12 volts

yes: you are right, I wasn't paying enough thinking into it, math was right terms were backwards :rollin:

I is amps and E is volts,

the insulation does not make it carry MORE amps it lets the wire get hotter before it melts the wire.


current (actually ELECTRON FLOW) flowing over outside does not matter if it is low freq (DC) or extreme high frequency (though wave guides are use primarily when talking VHF and stuff like microwave ovens and or radar devices, the frequency travels OK over outside of wires BUT begins to create RF interferences, hence a wive guide and as with any situation higher amps the more problems happen with HF. very high power devices use square / rectangle hollow tubes and simply direct the RF through the hollow tubing. no wires needed



ok got to eat dinner:

Mark M

 

[gemini5362]

yes: you are right, I wasn't paying enough thinking into it, math was right terms were backwards :rollin:

I is amps and E is volts,

the insulation does not make it carry MORE amps it lets the wire get hotter before it melts the wire.


current (actually ELECTRON FLOW) flowing over outside does not matter if it is low freq (DC) or extreme high frequency (though wave guides are use primarily when talking VHF and stuff like microwave ovens and or radar devices, the frequency travels OK over outside of wires BUT begins to create RF interferences, hence a wive guide and as with any situation higher amps the more problems happen with HF. very high power devices use square / rectangle hollow tubes and simply direct the RF through the hollow tubing. no wires needed



ok got to eat dinner:

Mark M

Mark I believe you might be incorrect in your statements about waveguide. Actually power is not a consideration for why you use waveguide. Frequency is the consideration. If you look at High Frequency devices such as Radar it uses waveguide for the recievers and the power coming into them is microwatts. The theory behind waveguide is that it is equivalent to two wires with 1/4 wavelength stubs attatched to them as insulators. The 1/4 wavelength stubs are electronically an open and keeps the wires from working like antennas. I would love to see some references I could look at that discusses DC current as moving outside of the wire. Every course I took in college had current moving through the wire until you started approaching RF that is what I was talking about in my post when I mentioned skin effect.
I have never heard the theory that insulation lets wire get hotter before it starts melting the wire. To the best of my knowledge insulation on wire has a couple of purposes and that is to keep the wire from shorting out to something else. I.E another phase, ground, etc. and possibly to keep it from corrosion.

 

[dtd24]

wow...............lots of info here. Not trying to wire the space shuttle, just a couple lights on my JD. LOL Just kidding around, you guys are very knowlegable, I have learned alot off this site.

Still to cold to finish up my project, but I am working on it.

 

[BobRip]

the insulation does not make it carry MORE amps it lets the wire get hotter before it melts the wire.

Mark, the insulation is what is damaged first by the heat, not the wire. So insulation thats melts or is damaged at higher temperatures allows the wire to carry more current without damaging the insulation.

Another point I don't think I saw here was that the wire between the battery and first fuse should be as short as possible. If a short to ground occurs here the wire will burn up very quickly and may cause other damage, keeping it short reduces the chance of this happening. In the Power Trac the fuse holder wire is connected to the starter motor main 12 volt terminal. The wire is about six inches long.

 

[gemini5362]

wow...............lots of info here. Not trying to wire the space shuttle, just a couple lights on my JD. LOL Just kidding around, you guys are very knowlegable, I have learned alot off this site.

Still to cold to finish up my project, but I am working on it.

Yeah it is getting kind of carried away. For what you are doing just get some 12 gauge stranded wire and you will be fine. To make it conventual get red wire for your positive leads and black for your negative. If you want to identify which wire goes to which light then get other colors than red for the positive lead to the lights

 

[mr.wayne]

Has anyone tried these lights from Harbor Freight? Item # 37537-OVGA. I would put a link, but don't know how. I've been looking at lights for my tractor and run across these. They are very compact but says they cast a 3" wider beam than regular fog lights. Just wondering if anyone has tried them.
Thanks Wayne

 

[SPIKER]

Mark, the insulation is what is damaged first by the heat, not the wire. So insulation thats melts or is damaged at higher temperatures allows the wire to carry more current without damaging the insulation.

bobrip: yes you are correct, (the wire melts when the insulation is gone ) it does happen, we have to replace wires a lot due to melted insulation which then lets wires sort out.

wave guides will carry milliamp s to extremely high amps. (just ask any radar tech or radio station operator. ) correct that they are guiding the path of the electrons more over than carrying them. (contain them inside the wave guide which has size/shape & interior finishes, insulators and taps all specifically designed/engineered for the frequency and power range the guide is capable of carrying, which all help to guide the wave form from one point to the next point.

I've been out of electronic engineering for a good time and went into industrial electrical fabrication design/engineering as I didn't care for the electronic circuit math head ach constantly... most of the high power radar experience was gained when I was in military as an aircraft repair/testing tech for hydraulics, flight controls and onto electro-hydraulic systems. somehow we always got stuck maintaining the wave guides for the radar systems there due to the radar tech only wanted to touch stuff with cannon plugs on it every mechanical part was left up to use, since it was similar to tubing we (the hydraulic specs) got to help take care of it. one day we were covered in hyd oil from armpits to toes of our socks the next day in white cotton gloves with ultra clean requirements for the wave guides. go figure.

I'll have to dig out my basic electrical engineering & physics books for quotes on how electrons flow ON the wire regardless of the frequency of flow... the high frequency the electrons begin to emit radiation in form of RF.
Granted I've been out of the college for 10+ years but I haven't read anything lately that states they have found that the electrons are flowing INSIDE the wire now but I could have missed that one

anyhow I'll try & dig for some ref material but it is stored out in the new storage shed until my new home is done.

markM

 

[dtd24]

Hey Guys,
Thanks to all of you my lights work great, here are the pics I promised!!!!!

 

[kennyd]

Great job!