6a)
U=2 V
R=4 Ω
I=U/R
I=2/4
I=0,5 A
6b)
U1=I1*R
I1=I/2
I1=0,25 A
U1=4*0,25
U1=1 V
7)
I=1 A
t=60 s
W=1200 J
R=?
W=U*I*t
U=I*R
W=I²*R*t
R=W/(I²*t)
R=1200/(1²*60)
R=20 Ω
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6a)
U=2 V
R=4 Ω
I=U/R
I=2/4
I=0,5 A
6b)
U1=I1*R
I1=I/2
I1=0,25 A
U1=4*0,25
U1=1 V
7)
I=1 A
t=60 s
W=1200 J
R=?
W=U*I*t
U=I*R
W=I²*R*t
R=W/(I²*t)
R=1200/(1²*60)
R=20 Ω