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Консультация № 180387
21.10.2010, 20:37
0.00 руб.
0
2
2
Вечер добрый, уважаемые эксперты, требуется помощь со следующей задачей:
Электрический источник, замкнутый на сопротивление 10 Ом,
дает ток 3 А. Тот же источник, замкнутый на сопротивление 20 Ом,
дает ток 1,6 А. Найти ЭДС и внутреннее сопротивление источника.
Электрический источник, замкнутый на сопротивление 10 Ом,
дает ток 3 А. Тот же источник, замкнутый на сопротивление 20 Ом,
дает ток 1,6 А. Найти ЭДС и внутреннее сопротивление источника.
Обсуждение
21.10.2010, 20:54
общий
это ответ
Здравствуйте, Aptemis!
Составим уравнения согласно закону Ома для полной (замкнутой) цепи
I1=E/(R1+r) (1)
I2=E/(R2+r) (2)
Решаем систему уравнений.
Получаем
E = 34,3 B
r = 1,4 Ом
Удачи
Составим уравнения согласно закону Ома для полной (замкнутой) цепи
I1=E/(R1+r) (1)
I2=E/(R2+r) (2)
Решаем систему уравнений.
Получаем
E = 34,3 B
r = 1,4 Ом
Удачи
4
Об авторе:
С уважением
shvetski
С уважением
shvetski
Неизвестный
21.10.2010, 22:20
общий
это ответ
Здравствуйте, Aptemis!
Дано:
I1=3 A
I2= 1.6 A
R1 = 10 Ом
R2 = 20 Ом
Найти:
E (ЭДС) - ?
r - ?
Решение:
По закону Ома для полной замкнутой цепи:
I1=E/(R1+r)
I2=E/(R2+r)
Для простоты чтобы выразить ЭДС и внутреннее сопротивление источника, подставляем числовые данные в формулу и получаем:
3=E/(10+r)
1,6=E/(20+r)
выражаем из первого и второго уравнения ЭДС:
Е = 30+3r (*)
Е = 32+1,6r
Приравниваем оба получившихся уравнения и получаем r:
r = 2/1,4 = 1,43 (Ом)
и подставляем в выражение (*)
Е = 30+3*1,43 = 34,3 (В)
Дано:
I1=3 A
I2= 1.6 A
R1 = 10 Ом
R2 = 20 Ом
Найти:
E (ЭДС) - ?
r - ?
Решение:
По закону Ома для полной замкнутой цепи:
I1=E/(R1+r)
I2=E/(R2+r)
Для простоты чтобы выразить ЭДС и внутреннее сопротивление источника, подставляем числовые данные в формулу и получаем:
3=E/(10+r)
1,6=E/(20+r)
выражаем из первого и второго уравнения ЭДС:
Е = 30+3r (*)
Е = 32+1,6r
Приравниваем оба получившихся уравнения и получаем r:
r = 2/1,4 = 1,43 (Ом)
и подставляем в выражение (*)
Е = 30+3*1,43 = 34,3 (В)
5
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