Вопрос школьника по предмету Физика
Найти величину тока в шести электродвигателях, установленных на электровозе, если
напряжение на линии 3 кВ, а механическая мощность каждого двигателя 360 кВт;
КПД двигателей равен 90%.
(ответ должен получится 800А)
Ответ учителя по предмету Физика
Ответ:
800 A
Объяснение:
U=3*10^3 B P1=360*10^3 Вт n=6 η=0.9 (90%) I=?
===
η=Pп/Рз=P1*n/(I*U)
I=P1*n/(η*U)=360*10^3*6/(0.9*3*10^3)=800 A
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