Question

Помогите плииз , очень срочно!!!

Answer 1

Ответ:

Объяснение:

253

$R_0 = \dfrac{R_1R_2}{R_1 + R_2} = \dfrac{60*20}{60+20} = 15~Om$

$I = \dfrac{U}{R_0} = \dfrac{7.5}{15} = 0.5~A$

254

$R_0 = \dfrac{R_1R_2}{R_1 + R_2} = \dfrac{40*10}{40+10} = 8~Om$

$I = \dfrac{U}{R_0} = \dfrac{1.6}{8} = 0.2~A$

255

$I_1 = I_2\\Q_1 = I_1^2R_1t \Rightarrow I_1^2t = \dfrac{Q_1}{R_1}\\Q_2 = I_2^2R_2t = = I_1^2R_2t = \dfrac{Q_1R_2}{R_1} = \dfrac{1000*50}{100} = 500~J$

256

$I_1 = I_2\\Q_2 = I_2^2R_2t \Rightarrow I_2^2t = \dfrac{Q_2}{R_2}\\Q_1 = I_1^2R_1t = = I_2^2R_1t = \dfrac{Q_2R_1}{R_2} = \dfrac{1000*100}{50} = 2000~J$