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U = I * R
I - natężenie prądu [A]
R - opór / rezystancja [Ohm]
U - napięcie [V]
U = 20V
R = 5 kOhm = 5000Ohm
I = U/R
I = 20/5000
I = 0.004A
I = 4[mA]
u=20v
r= 5000 Ohm
wzór po przekształceniu R=U/I→ I=U/R
I=U/R
I=20/5000
I=0,004 A
I tyle :)
R= U/I wiec I= U/R
I= 20/5 = 4 ampery