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Electric current / voltage resistance /

The electric current is only indirectly through its effect can be seen:

Magnetic effect from eg generator
heating effect Heatable discs eg, sit
Light effects, eg headlights
Chemical effect battery

The electrical current in metallic conductors is eg the directed movement of free electrons.

The directed movement of free electrons is concluded under the influence of an electric voltage, free electrons are located on the outer shells of metal atoms.

balancing the desire of electric charge is the electrical voltage, it causes the flow of electric current .


The DC to keep the poles change polarity once adopted, remains positive (+) positive and the negative (-) is electrically biased negatively.

for AC voltage changes the polarity of the AC voltage in the electric power supply socket example, 100 times per second at 50Hz. image below

an example.
DC voltage causes a direct current.
AC voltage causes an alternating current.
Three-phase AC voltage causes a phase. is






Great of electrical resistance depends on: Material, the cross-sectional area, length and temperature of the conductor.
Werstoffe set the flow of electric current, a different resistance. This is expressed by the specific electrical resistance of the material.

specific electrical resistance is a resistance of a conductor of 1 m long and 1 mm / 2 at 20 ° C.
The specific resistance symbols ρ has rho (ro) small letter, the great electrical resistance can be calculated:

R = ρ * (times) I : resistance (due to) q R = electrical in Ohm
ρ = specific electrical resistance in ohms * mm2 : m at 20 ° C
l = length of conductor in m
q = cross-sectional area of conductor in mm2

materials are resistant to their electric USA:

Head

non-conductors (insulators)

semiconductors. have

example copper, aluminum, carbon materials are the electrical current to the well, in other words small specific resistance.