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P=1000W=1kW
1*1/4=1/4kWh
1/4*32gr=8gr
4) a)szeregowo:
Rz-R1+R2+R3
Rz=2+3=5
B)równoległy:
1/R1+1/R2=1/R3
1/2+1/3=5/6
9) R=U/I
R=220/100
R=2,2 (ohm)