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k=9 ∙109C−2 Nm2
F=k ∙Q1 ∙Q2
r2−samo za zrak i vakum
F= 14 ∙ π ∙ ε o ∙ εr
∙Q1 ∙Q2
r2
ε=εO ∙ εr
________________________________________________________________________e=1.6 ∙10−19C
Q=n∙ e ;e=1.6 ∙10−19
I=Qt
J= Is−gustoća struje-a/m2
I=e ∙n ∙ S ∙ v
________________________________________________________________________
I=UR
________________________________________________________________________
R=ρ∙ls
Ovisnost električnog otpora o temperaturi∆ R=α ∙ Ro ∙∆ t – ako početna temp nije nula
R=R0(1+α ∙∆ t )
Rad i snaga električne sileW =U ∙ I ∙ t
ε 0=8.8542 ∙10−12
W =F ∙ s
P=Wt
P=U ∙ I
η=P I
PU
=W I
WU
=F I
FU
P = I2 ∙R
P = U2
R
Strujni krugε−elektromotorni napon
Ru−unutarnjiotpor
R – vanjski otpor
ε=wne
Q
ε=I ∙ Ru+ I ∙ R -> I=ε
Ru+R
I= εRu+R
Im=εRu
me = 9.1 ∙ 10-31 kg