Joule
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Définition
L'unité SI d'énergie, égale au travail effectué par une force d'un newton sur une distance d'un mètre (1 J = 1 N·m = 1 kg·m²/s²).
Explication
Named after physicist James Prescott Joule. Lifting a 100 g apple by 1 meter requires approximately 1 joule of energy. A food calorie (kcal) equals 4,184 joules; a AA battery stores about 9,000 J; an average human daily caloric intake of 2,000 kcal equals roughly 8.4 million joules.
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RELATED TERMS
Mètre
L'unité SI de base de longueur, définie comme la distance parcourue par la lumière en 1/299 792 458 de seconde.
Kilogramme
L'unité SI de base de masse, définie par la constante de Planck.
Seconde
L'unité SI de base du temps, définie par les transitions de l'atome de césium-133.
Kelvin
L'unité SI de base de température thermodynamique, dont l'origine est le zéro absolu.
Ampère
L'unité SI de base du courant électrique.