`color{#0000FF}{B} color{#0000EE}{a} color{#0000EE}{o} color{#0000CC}{o} color{#0000BB}{H} color{#0000AA}{u} color{#000099}{y} color{#000088}{y}`

PTM: `(R_1////R_2)` nt `(R_3////R_4)`

`R_1=2\Omega`

`R_2=3\Omega`

`R_3=4\Omega`

`R_4=6\Omega`

`U=18V`

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a, `R=?`

b, `I_1,I_2,I_3,I_4=?`

`U_1,U_2,U_3,U_4=?`

$\\$

a, `R=R_(12)+R_(34)=(R_1R_2)/(R_1+R_2)+(R_3R_4)/(R_3+R_4)=(2.3)/(2+3)+(4.6)/(4+6)=3,6\Omega`

b, `I=U/R=18/(3,6)=5A`

`I=I_(12)=I_(34)=5A`

`U_(12)=I_(12)R_(12)=5.(2.3)/(2+2)=6V`

`R_1////R_2=>U_(12)=U_1=U_2=6V`

`I_1=U_1/R_1=6/2=3A`

`I_2=U_2/R_2=6/3=2A`

`U_(34)=U-U_(12)=18-6=12V`

`R_3////R_4=>U_(34)=U_3=U_4=12V`

`I_3=U_3/R_3=12/4=3A`

`I_4=U_4/R_4=12/6=2A`