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Консультация № 189570
11.06.2016, 20:31
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Здравствуйте! У меня возникли сложности с таким вопросом:
На рис. 3.23 изображена схема потенциометра . С помощью этого устройства можно регулировать подаваемое на прибор R напряжение U в пределах от 0 до U0 , где U0 - напряжение источника постоянного ток. В простейших потенциометрах сопротивление R0 выполняется в виде однородной проволоки , по которой скользит ползунок П. Найти напряжение U, снимаемое с потенциометра на прибор R как функцию расстояния х ползунка потенциометра от конца проволоки R. Исследовать случай R >> R0.
На рис. 3.23 изображена схема потенциометра . С помощью этого устройства можно регулировать подаваемое на прибор R напряжение U в пределах от 0 до U0 , где U0 - напряжение источника постоянного ток. В простейших потенциометрах сопротивление R0 выполняется в виде однородной проволоки , по которой скользит ползунок П. Найти напряжение U, снимаемое с потенциометра на прибор R как функцию расстояния х ползунка потенциометра от конца проволоки R. Исследовать случай R >> R0.
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Обсуждение
12.06.2016, 11:08
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Посмотрите на решение задачи из решебника на английском языке:
Об авторе:
Facta loquuntur.
Facta loquuntur.
13.06.2016, 11:14
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Последняя строка значит следующее:
Если сопротивление прибора значительно больше сопротивления проволоки, то формула сводится к V=V0x/l
Если сопротивление прибора значительно больше сопротивления проволоки, то формула сводится к V=V0x/l
13.06.2016, 11:36
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Не совсем, это не слишком удачный вариант реализации устройства с точки зрения выделяющейся внутри мощности. Но если требуется подать постоянное и достаточно точно регулируемое напряжение на что-то с очень большим R, то можно взять потенциометр с R0 гораздо меньшим чем R и получить выходное напряжение, соответствующее такой формуле.
13.06.2016, 16:21
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Ibram Решено не правильно, препод возвращает эту задачу .
Какие замечания сделал преподаватель?
Об авторе:
Facta loquuntur.
Facta loquuntur.
13.06.2016, 16:40
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В том то и проблема, что он не говорит что у меня не правильно, а просто возвращает тетрадь
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13.06.2016, 16:52
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По-видимому, Вы не сумели ответить на его вопросы, и он понял, что Вы не сами решали задачу. Чем же мы можем Вам помочь в таком случае? Почему Вы не задавали вопросы по существу решения мне вчера?
Об авторе:
Facta loquuntur.
Facta loquuntur.
13.06.2016, 16:55
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он мне ничего не задавал, я просто сдал , потом вернулся через 20 мин и он говорит что задача не принята , начало правильное , а дальше нет .
13.06.2016, 22:02
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Ibram Можно уточнить, откуда были взяты начальные формулы ?
Решение, которое я привёл в своём сообщении, было взято из книги "Solutions to I.E. Irodov's problems in General Physics. Volume I".
Об авторе:
Facta loquuntur.
Facta loquuntur.
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