From 8a30d8b57ad831a6b0fbb83e729f8c5cbc1768fd Mon Sep 17 00:00:00 2001
From: Orestis <orestis.malaspinas@pm.me>
Date: Mon, 24 Apr 2023 09:59:33 +0200
Subject: [PATCH] added kirchhof images

---
 06_cicruits_electriques.md   |  14 +-
 figs/complex_res_current.svg | 664 +++++++++++++++++++++++++++++++++++
 figs/two_res_kirch.svg       | 316 +++++++++++++++++
 3 files changed, 993 insertions(+), 1 deletion(-)
 create mode 100644 figs/complex_res_current.svg
 create mode 100644 figs/two_res_kirch.svg

diff --git a/06_cicruits_electriques.md b/06_cicruits_electriques.md
index 2778996..5cab714 100644
--- a/06_cicruits_electriques.md
+++ b/06_cicruits_electriques.md
@@ -245,9 +245,21 @@ $$
 
 
 Pour des circuits beaucoup plus compliqués que ceux vus ici, il faut noter qu'il y a un ensemble
-de règles qu'on peut appliquer pour déterminer le courant dans un circuit: les **lois de Kirchoff**.
+de règles qu'on peut appliquer pour déterminer le courant dans un circuit: les **lois de Kirchhoff**. Il s'agit d'un certain nombre de règles très pratiques qui sont des applications des lois de conservation que nous avons déjà vues.
 
+Le première loi de Kirchhoff est basée sur la loi de conservation de la charge électrique. Elle dit que:
 
+À une intersection, la somme de tous les courants entrant dans l'intersection, doit être égale à la somme des courants quittant l'intersection.
+
+Pour résumer, tout ce qui entre à une intersection doit en sortir (sinon ça voudrait dire qu'il y a une fuite ou une source quelque part). Par exemple sur la figure @fig:complex_res_current, on voit qu'à l'intersection $a$, on a le courant $I_1$ qui est entrant, et les courant $I_2$ et $I_3$ qu sont sortants. Ainsi on a $I_1=I_2+I_3$.
+
+![Illustration de la 1e loi de Kirchhoff](figs/complex_res_current.svg){#fig:complex_res_current width=50%}
+
+La seconde loi de Kirchhoff, est une application de la conservation de l'énergie. Elle dit que sur n'importe quelle chemin fermé, le changement de potentiel doit être nul.
+
+Ainsi sur la @fig:two_res_kirch, on a deux résistances, $R_1$ et $R_2$, ainsi qu'ûn potentiel $V$. Si on démarre du point $a$, on a un potentiel $V$ qui est inchangé. Puis au point $b$, avant $R_1$, on a toujours le même potentiel. Au point $c$, on a une première chute de potentiel, car $R_1$ est passée par là. Puis en $d$ on atteint un potentiel nul (toute l'énergie a été consommée) après avoir passé $R_2$. Le potentiel en $e$ est toujours nul. Puis on repasse par la batterie, et on revient en $a$ pour fermer la boucle. En $a$ on a avoir à nouveau un potentiel $V$ et ainsi on voit que le changement de potentiel est nul.
+
+![Illustration de la 2e loi de Kirchhoff](figs/two_res_kirch.svg){#fig:two_res_kirch width=50%}
 
 ## Les circuits contenant des capacités en parallèle ou en série
 
diff --git a/figs/complex_res_current.svg b/figs/complex_res_current.svg
new file mode 100644
index 0000000..0b391e4
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GitLab