On a donc : cos(30º) = (√3)/2, soit environ 0,866. La dernière modification de cette page a été faite le 18 septembre 2020 à 23:49. Vous pouvez utiliser les kelvins en lieu et place des degrés Celsius, puisque l'échelle Kelvin a la même graduation que l'échelle Celsius (une différence de 3 °C est aussi une différence de 3 kelvins). Cet article a été consulté 28 550 fois. Ce résultat peut être obtenu avec une calculatrice ayant la fonction cosinus. If you multiply the number of watts by the number of seconds, you'll end up with joules. La chaleur spécifique d'un élément varie en fonction de la température et de la pression ambiantes. En conséquence, 1 J = 10 000 000 ergs. This formula works for any form of power measured in watts, but electricity is the most common application. In science, the joule is the unit of energy or work. Énergie et stockage de l’électricité : quels sont les enjeux ? L'effet Joule résulte du fait que les électrons, en circulant dans le matériau conducteur, font vibrer les atomes qui le constituent. To find out how much energy a 60W light bulb consumes in 120 seconds, simply multiply (60 watts) x (120 seconds) = 7200 Joules. Pour créer cet article, 18 personnes, certaines anonymes, ont participé à son édition et à son amélioration au fil du temps. Le joule est à la fois une unité de travail, d'énergie et de chaleur qui sert quotidiennement en recherche-développement. Si, dans votre exercice, on vous donne déjà les valeurs des forces de décomposition (« composante verticale » et « composante horizontale »), le calcul « force x cos(θ) » a donc déjà été fait : vous pouvez sauter les étapes qui suivent. The erg was adopted as its unit of energy in 1882. Si nombre d'appareils ont une puissance exprimée en watts, milliwatt ou kilowatts, la fourniture électrique est quant à elle exprimée en kilowattheures. En navigant sur notre site, vous acceptez notre, {"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/9\/95\/Calculate-Joules-Step-1-Version-3.jpg\/v4-460px-Calculate-Joules-Step-1-Version-3.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/95\/Calculate-Joules-Step-1-Version-3.jpg\/v4-728px-Calculate-Joules-Step-1-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"
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<\/div>"}, Calculer une puissance (en watts) en joules, {"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/e\/e3\/Calculate-Joules-Step-11-Version-3.jpg\/v4-460px-Calculate-Joules-Step-11-Version-3.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e3\/Calculate-Joules-Step-11-Version-3.jpg\/v4-728px-Calculate-Joules-Step-11-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"
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<\/div>"}, Calculer une quantité de chaleur en joules, {"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/8\/82\/Calculate-Joules-Step-17-Version-3.jpg\/v4-460px-Calculate-Joules-Step-17-Version-3.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/82\/Calculate-Joules-Step-17-Version-3.jpg\/v4-728px-Calculate-Joules-Step-17-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"
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<\/div>"}, Calculer une énergie électrique en joules, {"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/8\/89\/Calculate-Joules-Step-23-Version-3.jpg\/v4-460px-Calculate-Joules-Step-23-Version-3.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/89\/Calculate-Joules-Step-23-Version-3.jpg\/v4-728px-Calculate-Joules-Step-23-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"
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