a)
Opornik 1
U = 1 V
I = 4 mA = 0,004 A
-----------------
R = ?
R = U/I = 1V/0,004A = 250 Ω
R1 = 250 Ω
Opornik 2
U = 2 V
I = 20 mA = 0,02 A
-----------------
R = ?
R = U/I = 2V/0,02A = 100 Ω
R2 = 100 Ω
b)
R = 250 Ω
I = 20 mA = 0,02A
---------------------------
U = ?
U = I*R = 0,02A*250Ω = 5 V
U = 5 V
