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Консультация № 160269
12.02.2009, 10:12
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здравстуйте!Уважаемые эксперты помогите решить!
Найти падение потенциала на медном проводе длинной 1=500м и диаметром 2мм, если ток в нем 2А
Найти падение потенциала на медном проводе длинной 1=500м и диаметром 2мм, если ток в нем 2А
Обсуждение
Неизвестный
12.02.2009, 11:25
общий
это ответ
Здравствуйте, филимонова анна валерьевна!
Решение: Дано: l =500м; d = 2мм; I =2A; ρ = 0,0172 Ом*мм^2/м (из таблиц для меди)
Падение потенциала, или падение напряжения выражается формулой:
U = I*R, (1)
где I – сила тока, R – сопротивление медного провода.
R = (ρ*l)/S; (2)
Площадь сечения провода: S = (π*d^2)/4, (3)
где d – диаметр провода.
Сопоставляя выражения (1) – (3), получаем:
U = (I*ρ*l)/((π*d^2)/4) = ((4*2А*0,0172 Ом*мм^2/м)*500м)/(3,14*4мм^2) =
= (2А*0,0172 Ом*500)/(3,14) = 17,2/3,14 = 5,48 B.
Ответ: 5,48 В.
Решение: Дано: l =500м; d = 2мм; I =2A; ρ = 0,0172 Ом*мм^2/м (из таблиц для меди)
Падение потенциала, или падение напряжения выражается формулой:
U = I*R, (1)
где I – сила тока, R – сопротивление медного провода.
R = (ρ*l)/S; (2)
Площадь сечения провода: S = (π*d^2)/4, (3)
где d – диаметр провода.
Сопоставляя выражения (1) – (3), получаем:
U = (I*ρ*l)/((π*d^2)/4) = ((4*2А*0,0172 Ом*мм^2/м)*500м)/(3,14*4мм^2) =
= (2А*0,0172 Ом*500)/(3,14) = 17,2/3,14 = 5,48 B.
Ответ: 5,48 В.
Форма ответа
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