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People with DC electrical know how
#9023425
03/23/24 02:17 AM
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Joined: Mar 2019
Posts: 19,139
TCM3
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Question. I know resistance produces heat. But can the opposite happen? Will heat from another object, cause resistance to increase in a circuit? Or at a suspected poor connection, even though the circuit is not producing its own heat.
Last edited by TCM3; 03/23/24 02:22 AM.
Do not forget to entertain strangers, For by so doing some have unwittingly entertained angels Hebrews 13:2 (R-TX)
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Re: People with DC electrical know how
[Re: TCM3]
#9023438
03/23/24 03:01 AM
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Joined: Jul 2013
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Hirogen
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Question. I know resistance produces heat. But can the opposite happen? Will heat from another object, cause resistance to increase in a circuit? Or at a suspected poor connection, even though the circuit is not producing its own heat.
Generally speaking heat increases resistance. So take a DC circuit at -40 and it will have less resistance then the same circuit at 100. So yes if another object is causing your circuit to absorb heat the circuit resistance will increase. Also a suspected poor connection if it is actually is a poor connection = increased resistance = more heat = more voltage drop.
Last edited by Hirogen; 03/23/24 03:05 AM.
Never violate a woman, nor harm a child. Do not lie, cheat or steal. These things are for lesser men. Protect the weak against the evil strong. And never allow thoughts of gain to lead you into the pursuit of evil.
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Re: People with DC electrical know how
[Re: Hirogen]
#9023440
03/23/24 03:17 AM
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Joined: Mar 2019
Posts: 19,139
TCM3
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Question. I know resistance produces heat. But can the opposite happen? Will heat from another object, cause resistance to increase in a circuit? Or at a suspected poor connection, even though the circuit is not producing its own heat.
Generally speaking heat increases resistance. So take a DC circuit at -40 and it will have less resistance then the same circuit at 100. So yes if another object is causing your circuit to absorb heat the circuit resistance will increase. Also a suspected poor connection if it is actually is a poor connection = increased resistance = more heat = more voltage drop. Thats what i was looking for. Thank you sir..
Do not forget to entertain strangers, For by so doing some have unwittingly entertained angels Hebrews 13:2 (R-TX)
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Re: People with DC electrical know how
[Re: TCM3]
#9023449
03/23/24 04:28 AM
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Joined: Apr 2009
Posts: 6,110
pdr55
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I only know what I learned in USN BEEP school…E=IxR. Hope that helps.
If you`re running down my country, man, You`re walking on the fighting side of me. (Merle)
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Re: People with DC electrical know how
[Re: TCM3]
#9023451
03/23/24 04:33 AM
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Joined: Apr 2009
Posts: 6,110
pdr55
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In a nutshell, yes, a bad connection will produce heat ie..resistance.
If you`re running down my country, man, You`re walking on the fighting side of me. (Merle)
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Re: People with DC electrical know how
[Re: TCM3]
#9023465
03/23/24 05:58 AM
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Joined: Nov 2009
Posts: 69,214
NORML as can be
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(R-TX) .-- " TCNN CURL CRLB VFF VRNO AYR SNDL CGC TLRY MSOS "
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Re: People with DC electrical know how
[Re: NORML as can be]
#9023481
03/23/24 12:19 PM
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Joined: Mar 2019
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TCM3
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Do not forget to entertain strangers, For by so doing some have unwittingly entertained angels Hebrews 13:2 (R-TX)
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Re: People with DC electrical know how
[Re: TCM3]
#9023493
03/23/24 12:56 PM
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Joined: Dec 2020
Posts: 1,422
Sewer rat
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Resistance of copper wire increases around 0.2% per degree F. A 100 degree temperature increase will increase the resistance 20%. Curious what the context of your question is. Under normal conditions temperature fluctuations don’t cause issues unless you are talking about extreme temperatures or wiring that was marginal to begin with.
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Re: People with DC electrical know how
[Re: Sewer rat]
#9023565
03/23/24 02:51 PM
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Joined: Mar 2019
Posts: 19,139
TCM3
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Resistance of copper wire increases around 0.2% per degree F. A 100 degree temperature increase will increase the resistance 20%. Curious what the context of your question is. Under normal conditions temperature fluctuations don’t cause issues unless you are talking about extreme temperatures or wiring that was marginal to begin with. Im chasing a very random issue with my truck. It randomly idles up to around 1K rpm after driving awhile. Someone put a new pigtail for the throttle position sensor, so its spliced into the harness, not original. I noticed only when the motor and engine bay is hot, i can wiggle the spliced portion and the motor will idle up, and i can also idle it down where its supposed to be by doing that, but only when at operating temp. If you do it when its at the ambient air temp, nothing happens.... i was wondering if heat could play a factor in causing connection issues. I did find a poorly done wiring job under the heat shrink tubing. So i fixed that last night. No issues so far. I just had a theory in my mind and wanted to know if it was possible.
Do not forget to entertain strangers, For by so doing some have unwittingly entertained angels Hebrews 13:2 (R-TX)
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Re: People with DC electrical know how
[Re: TCM3]
#9023632
03/23/24 06:24 PM
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Joined: Dec 2011
Posts: 5,834
Lazyjack
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A poor electrical connection is a catch 22 situation.
The current flow through a poor connection causes heat. Heat causes the conductor and connection expand. Just as heating any metal causes expansion. The more it expands the poorer the connection. The more the metals expands, the worse the connection becomes.
And yes,external heat could have impact on connection due to the expansion of metal conductors.
I had a brake light issue. On warm days and a if you held brake pedal down for more than 3 minutes, I would get a light out signal on dash. After months of chasing ghost, it was an defective fuse, only failing when hot.
If the 2nd amendment was written just to include guns for hunting, why is there not an amendment to protect fishing poles?
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Re: People with DC electrical know how
[Re: TCM3]
#9023633
03/23/24 06:27 PM
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Joined: Dec 2011
Posts: 5,834
Lazyjack
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And... this situation is not confined to DC current, also applies to AC power as well.
If the 2nd amendment was written just to include guns for hunting, why is there not an amendment to protect fishing poles?
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