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P=W/t
R=U/I
P=U*I
t=20min=1/3 h
W=3,5kwh
I=50A
P=3,5kwh/1/3 h
P=3,5*3 kW
P=10,5 KW
U=P/I
U=10,5 KW/50A
U=10500 W/50A
U=210V
R=210V/50A
R=4,2Ω
moc 10,5 KW, opór 4,2Ω