diff --git a/06_cicruits_electriques.md b/06_cicruits_electriques.md
index 49b08c79dfd2510ece31fdd48b4268d83f8fd004..d7d054130d5462d9be0c967886eb93ead7c5a7d0 100644
--- a/06_cicruits_electriques.md
+++ b/06_cicruits_electriques.md
@@ -178,4 +178,35 @@ Exercice (Résistances multiples) #
 Deux résistances de $100\Omega$ sont connectées en parallèle ou en série sur une batterie de $24\V$. Quel est le courant total dans chaque circuit? Et la résistance équivalente?
 
 
----
\ No newline at end of file
+---
+
+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**. On ne va pas les lister ou les étudier ici.
+
+## Les circuits contenant des capacités en parallèle ou en série
+
+Comme les résistances, les capacités peuvent être placée en série ou en parallèle.
+Pour le cas parallèle (voir @fig:three_cap_par) chaque capacité est soumise à la même
+différence de potentiel $V$. Ainsi les 3 capacités ont les charges
+$$
+Q_1=C_1 V,\quad Q_2=C_2 V,\quad Q_3=C_3 V.
+$$
+La conservation de la charge impose que la charge totale sortant de la source de tension
+est donnée par
+$$
+Q=Q_1+Q_2+Q_3.
+$$
+
+![Les résistances $C_1$, $C_2$, $C_3$ sont connectées en parallèle à la source $V$ et accumulent les charges $Q_1$, $Q_2$, $Q_3$.](figs/three_cap_par.svg){#fig:three_cap_par width=50%}
+
+Si nous essayons de décrire ce circuit sous forme de circuit équivalent avec une seule capacité,
+$$
+Q=C_\mathrm{eq}V,
+$$
+on voit que
+\begin{align}
+C_\mathrm{eq}V&=Q_1+Q_2+Q_3,\nonumber
+C_\mathrm{eq}V&=(C_1+C_2+C_3)V,\nonumber
+C_\mathrm{eq}&=C_1+C_2+C_3.
+\end{align}
+
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