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  • $\begingroup$ Also as for Joule-Lentz law, does it show how much heat will be produced by wire at some moment $t$, or it shows the total summary heat from produced from 0 to $t$? $\endgroup$
    – Stdugnd4ikbd
    Commented Feb 4, 2022 at 10:45
  • $\begingroup$ Joule's law works for ac current as well, but one usually averages over the period of the ac oscillations when reporting the values. See here. Note that $220$V in a power socket is also root mean square value rather than the amplitude. $\endgroup$
    – Roger V.
    Commented Feb 4, 2022 at 10:48
  • $\begingroup$ I asked generally, about DC $\endgroup$
    – Stdugnd4ikbd
    Commented Feb 4, 2022 at 11:03
  • $\begingroup$ DC means direct current (постоянный ток), which is frequency-independent... perhaps I don't quite understand what you are asking. Or do you means that the bias has both constanta nd ac component? $\endgroup$
    – Roger V.
    Commented Feb 4, 2022 at 11:05
  • $\begingroup$ You probably, missed my first comment to Your answer, it was not about the topic, it was about Joule-Lentz law $\endgroup$
    – Stdugnd4ikbd
    Commented Feb 4, 2022 at 11:30