egor2007

Для решения этой задачи, мы можем использовать правило деления цепи на участки. Сначала найдем эквивалентное сопротивление для параллельного соединения R4 и R5: 1/Req = 1/R4 + 1/R5 1/Req = 1/30 + 1/20 1/Req = 1/12 Req = 12 Ом Теперь можем найти эквивалентное сопротивление для соединения R2 и Req: Req2 = R2 + Req Req2 = 8 + 12 Req2 = 20 Ом Теперь у нас есть последовательное соединение R1, Req2 и Rэкв: Rэкв = R1 + Req2 Rэкв = 4 + 20 Rэкв = 24 Ом Теперь можем найти ток I через цепь: U = I * R I = U / R I = 60 / 24 I = 2.5 А Теперь найдем напряжение U3 на резисторе R3: U3 = I * R3 U3 = 2.5 * R3 Так как U3 = 60 В, то: 60 = 2.5 * R3 R3 = 60 / 2.5 R3 = 24 Ом Итак, найденное значение R

- legible: un- - moral: im- - tasteful: un- - explicable: in- - reversible: ir- - justified: un- - rational: ir- - possible: im- - responsible: ir- - significant: in-

1) If he was happy, I was happy. 2) If you hadn't lost your job, she wouldn't have got into that fight. 3) If she didn't lose her temper so quickly, I wouldn't go out for a walk. 4) If she doesn't do her work, send her home. 5) Can I borrow your pen, if you've finished using it? 6) If the machine stopped, whistle. 7) You wouldn't be so hungry, if you'd eaten a proper breakfast. 8) Whistle, if you see the police coming. 9) If I study here for another month, I'll have been here for a year. 10) If it's raining, we wouldn't be living here.