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R=240Ω
U=?
I=?
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P=U*I
U=I*R
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I=P/U
U=P*R/U mnożę stronami przez U
U²=P/R
U=√(P*R)
U=√(60*240)=√14400=120V
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I=P/U=60W/120V=0,5A