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Le courant alternatif sinuso

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Title: Le courant alternatif sinuso


1
?????? ???????? ??????
Le courant alternatif sinusoïdal
2
???? ???????
?????? ???????? ??????
3
?????? ???????? ??????
1 - ?????? ????????? ???????
11????? ???? ???????
??? ??? ?????? ??????
??? ??? ???? ???????? ???????
??? ??? ???? ????????? ???????
?? ???????
4
?????? ???????? ??????
  • ???? ??????? ???? ???? ?? ?????? ?????? ??????
    ?????????

?????? ????? ???? ???? ????? (courbe)??? ??????
??????? ????? ?????? .
  • ????? ??? ?????? ??? ?????? (Axes ) ???? ???? ????

???????? (U ) ????? ???? ???? ????? ( t ) .
5
2-1 ?????? ?????
?????? ???????? ??????
  • ???? ???? ???? ???? ?????? ???? ??????? ??? ???
    ??

???????? ?? ????? DC .
  • ???? ??? ????? ?? ??? ?? ???? ???? ????? ????? .

6
3-1 ?????? ??????
?????? ???????? ??????
???? ???? ???? ?? ???? ????? ?????? ???? ???????
?? ???? ?? ???????? ?? ????? ( AC ) ????? ???
?????
?? ??? ?????? ?????? ??????? ??? ?????? ??????
)????? (
???? ??? ???? ?????? ???? ????? ????? ??????
????? .
7
?????? ???????? ??????
  • ????????? ???? ?????? ???? ???? ??????? ??????
    ????? ????

??? ???? ??????? ?????. Tension électrique
continu
  • ?????? ????????? ??? ???? ???? ???? ?? ???? ?????
    ?????

?????? ????? ???? ???????? ????? ??? ??? ?????
??????? ????????
???? ??? ???? ?????? ???? .Tension alternative
sinusoïdal
8
2- ?????? ?????? ???????? ??????
?????? ???????? ??????
  • 1 2 ?????? ??????? Um ?????? ???????? ??????

????? ?????? ???????? ?????? ??? ???? ????? ?????
Um
????? ????? ????? Um
???? ??? ?????? ?????? ???? ??????? .
9
?????? ???????? ??????
???? ??????? ?????? ?????? ????????? ?????? ?????
.
???? ???????? ???????
?? SV 2 V / div .
??????U m ( V )
????? t
U m n ? S V
U m 3 div ? 2 v/div
U m 6V
10
?????? ???????? ??????
??????
????? ????? ?? ??????? Deux alternances
????? ???? ????? ??? ?????? ????? ?????? ????
????? ??? ?????? ????? .
11
2 -2 ?????? ??????? U eff ????? ?????? ????
Valeur efficace
?????? ???????? ??????
???? ???? ???????????? ?????? ?????? ????? ??????
???
U eff 12V???? ?????? ??????? ????? ?????? ????
??? ???? ?????? .
12
3 -2 ??????? ??? Um ? U eff
?????? ???????? ??????
??????? ?????? ????????
U eff 12V
1,414
13
4-2 ????? T ??????? f
?????? ???????? ??????
  • ? - ????? La période T

???? ????? T ????? ?????? ???? ????? ???????
???? ???????? ?????? ???????? ???
?????? ??? ??? ?????? ????? ?? ?????? ???????
??????? ??????? ???? ??? ? s .
14
?????? ???????? ??????
???? ???????? ??????? S h 0, 5 ?s / div
T n S h
T 3 div 0, 5 ?s / div
T 1,5 ?s
15
?????? ???????? ??????
  • ? - ?????? La fréquence f

???? ?????? ????? ?????? ???? ??? ??????? ??
??????? ???? ??
f 1 ? T
?????? f ????? ??? ????????
???? ?????? ?? ?????? ?????? ?? ????? Hertz
???? ?? ? .Hz
16
????? ??????
?????? ???????? ??????
???? ????? ???????? ????? ????? ????? ????? f
500 Hz
?????? ?????? Um 20V
???? ??????? ??????? Sv ????? T?? ????????
??????? .Sh
17
???????
?????? ???????? ??????
1- ????? ???????? ??????? Sv
???? ??
Um n Sv
????
Um / n Sv

????? ????
Sv 20V / 2div
SV 10V / div
18
?????? ???????? ??????
2- ????? ?????T
???? ??
f 1/ T
????
T 1/ f
????? ????
T 1 / 500 Hz
T 0,002s
T 2 ms
19
?????? ???????? ??????
3- ????? ???????? ??????? .Sh
???? ??
T n Sh
????
Sh T / n
????? ????
Sh 2 ms / 3 div
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