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Консультация № 201818
04.12.2021, 18:54
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Для измерения параметров электрической цепи, при решении кейса Научно-технологического профиля, школьник Васечкин получил качестве оборудования милливольтметр с внутренним сопротивлением r=5 Ом и шкалой (пределом измерения) на U0=100 мВ.
Рассчитайте, какое необходимо добавочное сопротивление, чтобы измерить напряжение 100 В? Ответ дать в кОм, округлив до целого.
Для измерения параметров электрической цепи, при решении кейса Научно-технологического профиля, школьник Васечкин получил качестве оборудования милливольтметр с внутренним сопротивлением r=5 Ом и шкалой (пределом измерения) на U0=100 мВ.
Рассчитайте, какое необходимо добавочное сопротивление, чтобы измерить напряжение 100 В? Ответ дать в кОм, округлив до целого.
Обсуждение
04.12.2021, 19:55
общий
Адресаты:
Посмотрите примеры 6 и 7 здесь: Ссылка >>.
Об авторе:
Facta loquuntur.
Facta loquuntur.
05.12.2021, 11:39
общий
это ответ
Здравствуйте, Михаил!
Предлагаю Вам следующее решение задачи.
Дано: Uном=100 мВ=0,1 В -- предел измерения для вольтметра; Rи=5 Ом -- сопротивление измерительного механизма вольтметра; U=100 В -- напряжение, которое нужно измерить вольтметром.
Определить: Rд -- сопротивление добавочного резистора.
Согласно условию задачи, требуется расширить предел измерения в n=U/Uном=100/0,1=1000 раз. Тогда
Ответ: Rд[$8776$]5 кОм.
Литература
Дайнеко В. А. Электротехника: учеб. пособие / В. А. Дайнеко. -- Минск: РИПО, 2019.
Предлагаю Вам следующее решение задачи.
Дано: Uном=100 мВ=0,1 В -- предел измерения для вольтметра; Rи=5 Ом -- сопротивление измерительного механизма вольтметра; U=100 В -- напряжение, которое нужно измерить вольтметром.
Определить: Rд -- сопротивление добавочного резистора.
Решение
Согласно условию задачи, требуется расширить предел измерения в n=U/Uном=100/0,1=1000 раз. Тогда
Rд=Rи(n-1)=5[$183$](1000-1)=4995 (Ом)[$8776$]5 кОм.
Ответ: Rд[$8776$]5 кОм.
Литература
Дайнеко В. А. Электротехника: учеб. пособие / В. А. Дайнеко. -- Минск: РИПО, 2019.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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