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Консультация № 55357
13.09.2006, 22:16
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Задача.
Дана эликтрицеская цепь: истоник тока эдс E = 240 В, сопротивление R = 23 Ом, внутренее сопротивление иточника r = 1 Ом. Найти полную мощность P0 и полезную мощность P. Найти кпд.
и еще вопрос: кпд в эл. цепи определяется мощностью, выделеной на внешнее сопротивлении (т.е. вернее на всем кроме внутреннего) ?
Спасибо.
Дана эликтрицеская цепь: истоник тока эдс E = 240 В, сопротивление R = 23 Ом, внутренее сопротивление иточника r = 1 Ом. Найти полную мощность P0 и полезную мощность P. Найти кпд.
и еще вопрос: кпд в эл. цепи определяется мощностью, выделеной на внешнее сопротивлении (т.е. вернее на всем кроме внутреннего) ?
Спасибо.
Обсуждение
Неизвестный
13.09.2006, 22:35
общий
это ответ
Здравствуйте, Slade!Делаетется это так:
1.I=E/(R+r)=240/(23+1)=10
U=разность потенциалов или U=E
P=I^2*(R+r)=10*10*24=2400Дж
потом Вам надор найти кпд по формуле,иа полезную мощность вы найдете умножив,найденное кпд на мощность, полученную только что, P=2400Дж
1.I=E/(R+r)=240/(23+1)=10
U=разность потенциалов или U=E
P=I^2*(R+r)=10*10*24=2400Дж
потом Вам надор найти кпд по формуле,иа полезную мощность вы найдете умножив,найденное кпд на мощность, полученную только что, P=2400Дж
13.09.2006, 23:50
общий
это ответ
Здравствуйте, Slade!
Ток в цепи I=E/(R+r)
Полная мощность P0=IE=E^2/(R+r)=2400 Вт
Полезная мощность P=I^2*R=E^2/(R+r)^2*R=2300 Вт
КПД=P/P0=[E^2/(R+r)]/[E^2/(R+r)^2*R], после сокращений
КПД=R/(R+r)=23/24=95.8(3)%
Про КПД в таких цепях - это мощность на полезной нагрузке, отнесенная к полной мощности (т.е. зависит от потерь на тепловыделение в самом источнике и в подводящих проводах, которым в этой задаче пренебрегают).
Удачи Вам!
P.S. Дмитррий - вообще то в физике принято получать ответ в общем виде и только затем подставлять числа.
Ток в цепи I=E/(R+r)
Полная мощность P0=IE=E^2/(R+r)=2400 Вт
Полезная мощность P=I^2*R=E^2/(R+r)^2*R=2300 Вт
КПД=P/P0=[E^2/(R+r)]/[E^2/(R+r)^2*R], после сокращений
КПД=R/(R+r)=23/24=95.8(3)%
Про КПД в таких цепях - это мощность на полезной нагрузке, отнесенная к полной мощности (т.е. зависит от потерь на тепловыделение в самом источнике и в подводящих проводах, которым в этой задаче пренебрегают).
Удачи Вам!
P.S. Дмитррий - вообще то в физике принято получать ответ в общем виде и только затем подставлять числа.
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