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LES DANGERS DU COURANT ELECTRIQUE ( Catégorie des tensions)

a) Rappel: 

Qui parmi nous a déjà vu le courant à l’œil nu ?

Donner l'exemple de l'un de ces effets? 

Est-ce qu’on peut aussi toucher à ce courant ?

Pourquoi? 

Motivation de la leçon

Dans  ce chapitre, nous allons étudier les dangers de ce courant et ses différentes catégories des tensions.

Annonce 

Qu'allons- nous étudier aujourd'hui?

Analyse 

Prise de note par les élèves au tableau.  

Prise de note par les élèves au tableau.  

Synthèse

Qu'est ce qu'un courant alternatif ?

I.2. Catégorie des tensions

Nous avons au moins cinq catégories des tensions qui sont :

I.2.1. La très basse tension (T.B.T)

Est une valeur de la tension entre 0 à 50V en courant alternatif continu et de 0 à 75 V en courant alternatif sur son domaine d’emploi, elle est fréquemment utilisée en électronique et elle n’est pas transportable.

I.2.2. La base tension (BT)

C’est une gamme de tension compris entre 50V à 1000 V (1 KV) en DC et de 75 V à 750 V en AC ;

Elle est plus utilisée dans les usages comme :

  • Domicile pour la consommation interne comme externe,
  • Dans des petites usines de transformation etc..
  • Elle est transportable d’une maison à une autre, une rue à l’autre.

I.2.3. La moyenne tension (M.T)

Elle  varie de 1000V (1Kv) à 60 000 V (60 KV), elle est plus utilisée dans l’usage de transport de l’énergie d’un quartier à l’autre, d’une commune à l’autre.

I.2.4. La Haute tension (H.T)

Elle varie de   60 000 V (60Kv) à 300 000 V (300 KV) elle  est pour le transport d’une  ville à une autre, d’une province à l’autre.

I.2.5. Très haute tension (THT)

Une gamme supérieure à 300kv, elle est plus utilisée au transport d’un pays à l’autre voie même intercontinental…

I.3. Le courant électrique est corps humain

I.3.1. Le danger du courant

Dans le corps humain on se sent exposé à ces dangers au cas où il y a accident, ceux-ci sont dus soit à une imprudence, soit à une installation défectueuse.  

Un courant alternatif : est un  courant qui varie de sens pendant  une durée de période appelée la fréquence.

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