Title: Le courant alternatif sinuso
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Le courant alternatif sinusoïdal
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1 - ?????? ????????? ???????
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- ???? ??????? ???? ???? ?? ?????? ?????? ??????
?????????
?????? ????? ???? ???? ????? (courbe)??? ??????
??????? ????? ?????? .
- ????? ??? ?????? ??? ?????? (Axes ) ???? ???? ????
???????? (U ) ????? ???? ???? ????? ( t ) .
5 2-1 ?????? ?????
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- ???? ???? ???? ???? ?????? ???? ??????? ??? ???
??
???????? ?? ????? DC .
- ???? ??? ????? ?? ??? ?? ???? ???? ????? ????? .
63-1 ?????? ??????
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???? ???? ???? ?? ???? ????? ?????? ???? ???????
?? ???? ?? ???????? ?? ????? ( AC ) ????? ???
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)????? (
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????? .
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- ????????? ???? ?????? ???? ???? ??????? ??????
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??? ???? ??????? ?????. Tension électrique
continu
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?????
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??????? ????????
???? ??? ???? ?????? ???? .Tension alternative
sinusoïdal
82- ?????? ?????? ???????? ??????
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- 1 2 ?????? ??????? Um ?????? ???????? ??????
????? ?????? ???????? ?????? ??? ???? ????? ?????
Um
????? ????? ????? Um
???? ??? ?????? ?????? ???? ??????? .
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???? ??????? ?????? ?????? ????????? ?????? ?????
.
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?? SV 2 V / div .
??????U m ( V )
????? t
U m n ? S V
U m 3 div ? 2 v/div
U m 6V
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????? ????? ?? ??????? Deux alternances
????? ???? ????? ??? ?????? ????? ?????? ????
????? ??? ?????? ????? .
112 -2 ?????? ??????? U eff ????? ?????? ????
Valeur efficace
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???? ???? ???????????? ?????? ?????? ????? ??????
???
U eff 12V???? ?????? ??????? ????? ?????? ????
??? ???? ?????? .
123 -2 ??????? ??? Um ? U eff
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U eff 12V
1,414
134-2 ????? T ??????? f
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???? ????? T ????? ?????? ???? ????? ???????
???? ???????? ?????? ???????? ???
?????? ??? ??? ?????? ????? ?? ?????? ???????
??????? ??????? ???? ??? ? s .
14?????? ???????? ??????
???? ???????? ??????? S h 0, 5 ?s / div
T n S h
T 3 div 0, 5 ?s / div
T 1,5 ?s
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- ? - ?????? La fréquence f
???? ?????? ????? ?????? ???? ??? ??????? ??
??????? ???? ??
f 1 ? T
?????? f ????? ??? ????????
???? ?????? ?? ?????? ?????? ?? ????? Hertz
???? ?? ? .Hz
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?????? ???????? ??????
???? ????? ???????? ????? ????? ????? ????? f
500 Hz
?????? ?????? Um 20V
???? ??????? ??????? Sv ????? T?? ????????
??????? .Sh
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1- ????? ???????? ??????? Sv
???? ??
Um n Sv
????
Um / n Sv
????? ????
Sv 20V / 2div
SV 10V / div
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2- ????? ?????T
???? ??
f 1/ T
????
T 1/ f
????? ????
T 1 / 500 Hz
T 0,002s
T 2 ms
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3- ????? ???????? ??????? .Sh
???? ??
T n Sh
????
Sh T / n
????? ????
Sh 2 ms / 3 div