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Консультация № 195732
27.05.2019, 21:01
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:Вопрос на изображении
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Обсуждение
28.05.2019, 16:27
общий
это ответ
Здравствуйте, Apricot!
Я распознал условие задачи из Вашей картинки : Uвых = 10 В; Pвых = 0,5 Вт. R1=50 Ом, R2 =200 Ом. Рассчитать напряжение Uвх и мощность источника на входе цепи.
Куда течёт ток Iвых на Вашей схеме? Для понимания процеса и облегчения решения полезно подрисовать (мысленно или на черновике) к правому краю схемы ещё 1 резистор Rн (сопротивление нагрузки) параллельно резистору R2 .
По закону Ома вычислим ток через резистор R2 :
I2 = Uвых / R2 = 10 / 200 = 0,05 А .
Выходная мощность (на нагрузке) связана с выходным напряжением зависимостью :
Pвых = Uвых * Iвых
Из неё получим выходной ток Iвых = Pвых / Uвых = 0,5 / 10 = 0,05 А
Сумма этих токов протекает через резистор R1 : I1 = I2 + Iвых = 0,1 А
и создаёт на этом резисторе R1 падение напряжения U1 = I1 * R1 = 0,1*50 = 5 Вольт.
Искомое напряжение Uвх = Uвых + U1 = 10+5 = 15 Вольт,
Искомая мощность источника на входе цепи Pвх = Uвх * I1 = 15*0,1 = 1,5 Вт
Я распознал условие задачи из Вашей картинки : Uвых = 10 В; Pвых = 0,5 Вт. R1=50 Ом, R2 =200 Ом. Рассчитать напряжение Uвх и мощность источника на входе цепи.
Куда течёт ток Iвых на Вашей схеме? Для понимания процеса и облегчения решения полезно подрисовать (мысленно или на черновике) к правому краю схемы ещё 1 резистор Rн (сопротивление нагрузки) параллельно резистору R2 .
По закону Ома вычислим ток через резистор R2 :
I2 = Uвых / R2 = 10 / 200 = 0,05 А .
Выходная мощность (на нагрузке) связана с выходным напряжением зависимостью :
Pвых = Uвых * Iвых
Из неё получим выходной ток Iвых = Pвых / Uвых = 0,5 / 10 = 0,05 А
Сумма этих токов протекает через резистор R1 : I1 = I2 + Iвых = 0,1 А
и создаёт на этом резисторе R1 падение напряжения U1 = I1 * R1 = 0,1*50 = 5 Вольт.
Искомое напряжение Uвх = Uвых + U1 = 10+5 = 15 Вольт,
Искомая мощность источника на входе цепи Pвх = Uвх * I1 = 15*0,1 = 1,5 Вт
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