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Консультация № 201997
27.12.2021, 23:03
0.00 руб.
28.12.2021, 00:26
0
2
1
Нагреватель мощностью 63 кВт соединен с источником постоянного напряжения двумя алюминиевыми проводами. Длина каждого провода 600 м, площадь поперечного сечения 150мм^2. Сила тока в электрической цепи 100 А.
Какую долю мощность тепловых потерь в проводах составляет от мощности источника? Удельное сопротивление алюминия [$961$]=2,8*10^-8 Ом·м. Ответ приведите в [%].
Какую долю мощность тепловых потерь в проводах составляет от мощности источника? Удельное сопротивление алюминия [$961$]=2,8*10^-8 Ом·м. Ответ приведите в [%].
Обсуждение
30.12.2021, 13:05
общий
это ответ
Здравствуйте! Предлагаю следующее решение:
Дано: P = 63 кВт, [$8467$] = 600 м, S = 150 мм2, I = 100 А, [$961$] = 2.8 [$183$] 10-8 Ом[$183$]м.
Найти: k - ?
Решение:
Мощность источника U[$183$]I, где U - напряжение источника.
Сопротивление одного провода R = [$961$][$8467$]/S.
Суммарная мощность на проводах: I2[$183$]2R = 2I2R. (2R - эквивалентное сопротивление проводов)
Мощность источника отдается проводам и нагревателю, следовательно, мощность источника равна сумме мощностей проводов и нагревателя:
мощность источника P0 = 2I2R + P
Итого, искомое отношение
Ответ: k [$8776$] 3.43 %
Дано: P = 63 кВт, [$8467$] = 600 м, S = 150 мм2, I = 100 А, [$961$] = 2.8 [$183$] 10-8 Ом[$183$]м.
Найти: k - ?
Решение:
Мощность источника U[$183$]I, где U - напряжение источника.
Сопротивление одного провода R = [$961$][$8467$]/S.
Суммарная мощность на проводах: I2[$183$]2R = 2I2R. (2R - эквивалентное сопротивление проводов)
Мощность источника отдается проводам и нагревателю, следовательно, мощность источника равна сумме мощностей проводов и нагревателя:
мощность источника P0 = 2I2R + P
Итого, искомое отношение
Ответ: k [$8776$] 3.43 %
5
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