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Консультация № 195562
08.05.2019, 17:12
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Задание 7. Батарея состоит из трех параллельно соединенных источников тока с ЭДС ε = 12 В и с внутренним сопротивлением r = 2 Ом каждый. При каком сопротивлении внешней нагрузки полезная мощность равна 32 Вт ? Какую наибольшую мощность можно получить во внешней цепи? Сделать рисунок такой цепи.
Задание 7. Батарея состоит из трех параллельно соединенных источников тока с ЭДС ε = 12 В и с внутренним сопротивлением r = 2 Ом каждый. При каком сопротивлении внешней нагрузки полезная мощность равна 32 Вт ? Какую наибольшую мощность можно получить во внешней цепи? Сделать рисунок такой цепи.
Обсуждение
12.05.2019, 08:48
общий
это ответ
Здравствуйте, dar777!
Если батарея состоит из
параллельно соединённых источников с ЭДС 
В и с внутренним сопротивлением 
Ом каждый, то ЭДС батареи составляет 
ток в цепи 
полезная мощность 
(
-- сопротивление внешней нагрузки). Отсюда получим
(Ом), 
(Ом).
Значит, полезная мощность в цепи равна
Вт, если сопротивление внешней нагрузки 
Ом или 
Ом.
Продифференцируем функцию
Получим 
Приравняв числитель последнего выражения к нулю, будем иметь 
откуда 
(Ом). Следовательно, наибольшая мощность во внешней цепи достигается при 
Ом и составляет
(Вт).
График полезной мощности в зависимости от сопротивления внешней нагрузки показан здесь.
Чтобы сделать рисунок цепи, воспользуйтесь хотя бы правым рисунком в прикреплённом файле.
Если батарея состоит из
параллельно соединённых источников с ЭДС В и с внутренним сопротивлением Ом каждый, то ЭДС батареи составляет ток в цепи полезная мощность ( -- сопротивление внешней нагрузки). Отсюда получим (Ом), (Ом).Значит, полезная мощность в цепи равна
Вт, если сопротивление внешней нагрузки Ом или Ом.Продифференцируем функцию
Получим Приравняв числитель последнего выражения к нулю, будем иметь откуда (Ом). Следовательно, наибольшая мощность во внешней цепи достигается при Ом и составляет (Вт).График полезной мощности в зависимости от сопротивления внешней нагрузки показан здесь.
Чтобы сделать рисунок цепи, воспользуйтесь хотя бы правым рисунком в прикреплённом файле.
Прикрепленные файлы:
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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