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Charges and electric field
Coulomb´s law
charges
Electric field
Electric field of a dipole
Dipole moment
Elementary charge
Probe the field by a „test“ charge q
Gauss law
flux
Electrical flux
Gauss law and Coulomb law
E-Field of a conducting plate
Electrical potential
Applied work Wappl = q DV
Equipotential surfaces
Defined by DV=0,No work is done on a equipotential plane
Calculating potential in an electric field
Potential due to a point charge
A system of point charges
Calculating E from V
Capacity calculation
Parallel and Series connection of capacities
Energy stored in electric field
Dielectric constants
Dielectrics
Current and current density
i = dq/dt
1 Ampere = 1 A = 1 coulomb per second
i= i1 + i2
Resistance and resistivity
R = V/I Ohm´s law
1 Ohm = 1 W = 1 volt per ampere
r = E/J [Wm]
s = 1/r [1/Wm]
R= r L/A
J= s E
Power in Electric Circuits
Using Ohm´s law
Electrical circuits
EMF = electromotive force
Single loop circuit
Potential loop of a circuits
Multiloop circuits
i1 + i3 = i2
Substitute : i3R3
example
RC - circuits
t= RC