1) Дано: ε=99в, R₁=30 Ом, U=93в, P₁=67Вт
Найти: R₂, R, I, P

2) Дано: R=36 Ом, U=126в, m=0,8кг, t₁=5°C, t₂²=60°C, r=10,7 мин
Найти: I, P, η

3) Дано: R₁=20 Ом, R₂=40 Ом, R₃=40 Ом, I₂=0,4A
Найти: R, U, I, U₂
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