R12=(R1×R2)÷(R1+R2)=(4×4)÷(4+4)=2 (Ом)
R123=R12+R3=2+6=8 (Ом)
Rобщее=(R123×R4)÷(R123+R4)=(8×12)÷(8+12)=4,8 (Ом)
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R12=(R1×R2)÷(R1+R2)=(4×4)÷(4+4)=2 (Ом)
R123=R12+R3=2+6=8 (Ом)
Rобщее=(R123×R4)÷(R123+R4)=(8×12)÷(8+12)=4,8 (Ом)