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U=40V => I=0,8A
P=U*I=3,2W
21
Rz=R1+R2+R3=18omów
I=U/R=6V/18ohmów=1/3A
23
P=40kW=40 000W
t=45min=2700s
W=P*t=10 800 000J=10,8 MJ
24
P=100W
U=230V
I=P/U=0.434A
R=U/I=529omów
25
I(max)=16A
P=2200W+1710W=3910W
U=230V
I=P/U=17A
I>I(max) => nie wytrzyma
26.
wykres zbyt łatwy
R=U/I=6V/0,2A=30ohmów