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U=2V
I=0,4A
P=U*I=2V*0,4A=0,8W
P=0,8 W
b)
R=U/I=2V/0,4A=5Ω
P=U²/R
P*R=U²
U=√(P*R)=√(7,2W*5Ω)=√36 = 6V
U=6V
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