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TRANSFORMATION D'ENERGIE

4ème Pédagogie Générale - Physique

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TRANSFORMATION D'ENERGIE

Domaine	Science	Sous domaine	Science
Section	Pédagogie	Option	Pédagogie Générale
Discipline	Physique	Classe	4ème
Matériel didactique	Calculatrices	Auteur	SCHOOLAP.COM
Objectif opérationnel	A la fin de la leçon, l'élève sera capable de saisir le sens de changement lié à des substances physiques
Réference	Bibliographie : KAZADI, V et Cie, Physique 4ème, Programme national de physique, 2008, page 109.
Activité initiale
Rappel Quelle est la valeur de : a. h b. C		Rappel Quelle est la valeur de : a. h b. C a. 6, 62 . 10^-34 Js b. 310⁸ m/s.
Motivation Comment est appelé le fait de quitter de la farine aux beignets ?		Motivation Le fait de quitter de la farine aux beignets est appelé la transformation.
Annonce du Sujet Qu'allons-nous étudier aujourd'hui ?		Annonce du Sujet Aujourd'hui, nous allons étudier la transformation d'énergie.
Activité principale
Analyse W = travail mécanique échangé. Comment peut-on comprendre cette transformation ?		Analyse Transformation W = travail mécanique échangé. Illustrons un peu avec le groupe électrogène : il faut y mettre du pétrole ce dernier contient de l'énergie chimique libérée sous la forme d'énergie thermique par la combustion. L'énergie thermique, des gaz brûlés, est transformée en énergie mécanique recueilli sur l'axe du moteur. Le retour de l'alternateur transforme enfin cette énergie mécanique en énergie électrique. "En sus, l'énergie ne peut être créée ni détruite, elle ne peut cependant être transférée d'un corps à l'autre et peut être convertie d'une forme à l'autre ". C'est le PPE de la thermodynamique. Si AU = Q + W AU = Variation de l'énergie interne. Q = Chaleur échangée.
Synthèse
Qu'est-ce que nous venons de voir ?		Nous venons de voir la transformation d'énergie.

Messages Timeline Exceptions Views7 Route Queries14 Models18 Gate Session Request

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