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When to use to Pcb trace width calculator,there are two factors,ambient temp.and rise temp...what is the difference between them?

user255471
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    Ambient temperature is the local temperature assuming their is no current flowing. Rise temperature is the amount the temperature increases by because of the current. All tracks have resistance so will dissipate \$ I^2R \$ losses causing the track to get hotter. – Warren Hill Jun 16 '20 at 12:23
  • Thank you for your reply...But,before i design the pcb i do not know the amount of temperature that will be generate due to current ...so how to know it? – user255471 Jun 16 '20 at 12:27
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    The thinner the trace the more resistance it has and the hotter it gets. The trace width calculator takes the rise temperature you can accept to tell you the minimum trace width you need. Typically I can accept a 10 deg C rise. Or you can tell it the trace width you have and it will tell you the rise you can expect. – Warren Hill Jun 16 '20 at 12:51
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    Does this answer your question? [Sizing a trace on a PCB to carry 50 amps](https://electronics.stackexchange.com/questions/420988/sizing-a-trace-on-a-pcb-to-carry-50-amps) – Warren Hill Jun 16 '20 at 12:54
  • Thank you very much sir...your answer is very acceptable for me to understand..thank you – user255471 Jun 16 '20 at 12:58
  • I've used this many times http://saturnpcb.com/pcb_toolkit/ – TonyM Jun 17 '20 at 11:42

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