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t=20min=1/3 h
I=50A
P=?
R=?
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W=P*t
P=W/t=3,5/(1/3)=10,5 [kWh/h=kW]
P=U*I z prawa Ohma U=I*R stąd P=I²*R
R=P/I²=10500/50²=4,2Ω
P=10,5kW; R=4,2Ω