diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/50.structure-example/30.n3/textbook.en.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/50.structure-example/30.n3/textbook.en.md
index 18871230d..18856e1b4 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/50.structure-example/30.n3/textbook.en.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/50.structure-example/30.n3/textbook.en.md
@@ -326,6 +326,61 @@ most likely to 1 web page of M3P2, otherwise 2 or 3.
 
 ---------------------------------------------------------------------------------
 
+!! *BLOCK ELMAG3-15*
+!!
+!! *Possible title* : Coils and transformers
+!!
+!! *Short description* : coil = solenoid = choke - inductance -
+!! with and without ferromagnetic core - series and parallel - energy - and?
+!!
+!! *Idea* : it is for everyone at level 3. If it is too detailed for some, it is
+!! remains a description of this theme at level 2
+!!
+!! *Program elements, or structuring in chapters* :
+!!
+!! *For whom?* : All at level 3
+
+--------------------------------------------------------------------------------
+
+!!!! *BLOCK ELMAG3-16*
+!!!!
+!!!! *Possible title* : Interfaces, diodes and transistors?
+!!!!
+!!!! *Short description* :
+!!!!
+!!!! *For whom?* : Physicists, electronics, Telecoms
+
+--------------------------------------------------------------------------------
+
+!! *BLOCK ELMAG3-17*
+!!
+!! *Possible title* : Electrical circuits
+!!
+!! *Short description* : Voltage generators, current generators,
+!! receivers. Kirchhoff's laws, superposition theorem, Thévenin's theorem,
+!! Norton's theorem. Millman's relationship.
+!! Variable currents and alternating currents in
+!! the approximation of quasi – stationary regimes.
+!! Own regimes, transient regimes, time constant, forced regime.
+!! Fresnel representation, use of complexes, AC power, resonance.
+!! Use of complexes, charging and discharging of a capacitor, alternating bridges,
+!! LC, RLC circuits
+!!
+!! *Idea* : it is for everyone at level 3. If it is too detailed for some, it is
+!! remains a description of this theme at level 2
+!!
+!! *Program elements, or structuring in chapters* :
+!!
+!! *For whom?* : All at level 3.
+
+--------------------------------------------------------------------------------
+
+others
+
+
+
+
+
 !! *BLOC ELMAG3-15* 
 !!
 !! *Titre possible* : Selfs et transformateurs