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R= 2k omy = 2000 omów U=?
I= 2mA = 0,002A
R=U/I \*I
R*I= U
U= 0,002 * 2000= 4
[U]= Om* A= V
Odp. Napięcie wynosi 4 V
I=2mA=0,002A
U=?
P=?
U=I*R=0,002A*2000Ω=4V
P=U*I=4V*2mA=8mW