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I=P/U=50W/220V=0,23A
Q=P*t=50W*90*60s=270000J=270kJ
I(natężenie)=?
U(napięcie)=220V
P=U*I / /U
I=P/U
I=50W/220V
I=0.23A
Q(ciepło)=P*t
9min=5400s
Q=50W*5400s=270000J=270kJ