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Консультация № 179161
20.06.2010, 16:31
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Здравствуйте, помогите чем можете.Заранее благодарен.
Миллиамперметр имеет сопротивление 25 Ом, рассчитан на предельный ток 50 мА и снабжен шунтом на 10 А. Какую мощность рассеивает прибор, если он показывает силу тока 8 А?
Миллиамперметр имеет сопротивление 25 Ом, рассчитан на предельный ток 50 мА и снабжен шунтом на 10 А. Какую мощность рассеивает прибор, если он показывает силу тока 8 А?
Обсуждение
20.06.2010, 17:53
общий
это ответ
Здравствуйте, 4ever09. Если шкала у милиамперметра линейная и речь идёт о сети постоянного тока, то:
при максимальное отклонении стрелки прибора с шунтом при 10A через прибор течёт ток в 50 мА,
пропорционально при 8A через прибор течет ток X мА. Решаем пропорцию:
10A - 50 мА
8А - Х
Х= 8*50/10=40мА
Мощность, рассеиваемая прибором, p=iU. U=ir -> p=r*i2=(40*10-3)2*25=4*10-2Вт = 40 мВт
при максимальное отклонении стрелки прибора с шунтом при 10A через прибор течёт ток в 50 мА,
пропорционально при 8A через прибор течет ток X мА. Решаем пропорцию:
10A - 50 мА
8А - Х
Х= 8*50/10=40мА
Мощность, рассеиваемая прибором, p=iU. U=ir -> p=r*i2=(40*10-3)2*25=4*10-2Вт = 40 мВт
Об авторе:
Понеже не словес красных бог слушает, но дел наших хощет
Понеже не словес красных бог слушает, но дел наших хощет
21.06.2010, 04:43
общий
это ответ
Здравствуйте, 4ever09.
Чтобы избавиться от двусмысленного трактования понятия Прибор, назовём собственно Миллиамперметр словом Головка (токоизмерительная), а Миллиамперметр с шунтом - Система.
Если Головка имеет линейную шкалу и отображает показания 80% от максимального значения (8Ампер из 10), то ток Головки равен Iг=50мА*0.8=40мА=0.04A. На выводах Головки и всей системы при этом создаётся напряжение U=Iг*Rг=0.04*25=1.0 V
Какую мощность рассеивает Головка? Pг=Iг*U=0.04*1.00=0.04W=40mW
Какую мощность рассеивает система? Pс=Iс*U=8*1.00=8.00W
(На шунте рассеивается мощность Pш=Pс-Pг=7.96W , поскольку через шунт течёт не 8A, а 8-0.04A)
Успехов!
Чтобы избавиться от двусмысленного трактования понятия Прибор, назовём собственно Миллиамперметр словом Головка (токоизмерительная), а Миллиамперметр с шунтом - Система.
Если Головка имеет линейную шкалу и отображает показания 80% от максимального значения (8Ампер из 10), то ток Головки равен Iг=50мА*0.8=40мА=0.04A. На выводах Головки и всей системы при этом создаётся напряжение U=Iг*Rг=0.04*25=1.0 V
Какую мощность рассеивает Головка? Pг=Iг*U=0.04*1.00=0.04W=40mW
Какую мощность рассеивает система? Pс=Iс*U=8*1.00=8.00W
(На шунте рассеивается мощность Pш=Pс-Pг=7.96W , поскольку через шунт течёт не 8A, а 8-0.04A)
Успехов!
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