Electrostatics 3 Flashcards
1
Q
I=
A
Dq/dt
2
Q
In metallic conductors charge is carried by
A
Electrons
3
Q
In plasmas/ gaseous conductors charge is carried by
A
Electrons and positive ions
4
Q
In semi conductors charge is carried by
A
Electrons and holes
5
Q
Drift velocity (vd)= (Definition and 2 equations)
A
Constant average velocity of a particle
vd= µE I= vd* Pc* A
Pc= charge density
6
Q
Resistivity=
A
Material property which describes its ability to conduct electric currents
7
Q
Resistance =
A
Property of a device or object which describes its ability to conduct electric currents
8
Q
J is
A
Current density
9
Q
Pc is
A
Charge density
10
Q
Resistivity equations (2)
A
P=E/J
R=PL/A
11
Q
Conductivity equations (3)
A
σ=1/P
σ=J/E
J= σ(v/l)
12
Q
Conductivity is proportional to
A
Number of free electrons and electron mobility
13
Q
Resistivity rises linearly with …
It is also increased by
A
Temperature
Deformation
Impurities
Alloying p
14
Q
Pt=
A
P0(1+a(T1-T0))
