Rобщ=R1+R2*R3/(R2+R3)+R4+R5*R6*R7/(R5*R6+R6*R7+R5*R7)=1+2*3/(2+3)+1+2*3*2/(2*3+3*2+2*2)=1+6/5+1+12/(6+6+4)=4,057 Ом
Q=P*t=U²*t/R=20²*180/4,057≈17747 Дж
Rобщ=R1+R2*R3/(R2+R3)+R4+R5*R6*R7/(R5*R6+R6*R7+R5*R7)=1+2*3/(2+3)+1+2*3*2/(2*3+3*2+2*2)=1+6/5+1+12/(6+6+4)=4,057 Ом
Q=P*t=U²*t/R=20²*180/4,057≈17747 Дж