L=20
S=0.25
I=1.5
p=0.50
U=I*R
R=p*L/S
R=0.50*20/0.25
R=40 Ом
U=1.5*40
U=60B
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L=20
S=0.25
I=1.5
p=0.50
U=I*R
R=p*L/S
R=0.50*20/0.25
R=40 Ом
U=1.5*40
U=60B