In a similar slope an electron rolls down from the resistance formula is R = ρ(L/A); it mainly
the top toward the base, but now the top has a depends of the intrinsic parameter ρ, as bigger
potential of 10 volts and is zero volt on bottom; the value of ρ in ohms per meter, the more
the difference of potential pushes the electron opposition to the electric current the material
on the top to roll down toward the base, then has,
it also depends on L; the length of the
always the electron goes from a higher potential material, the bigger the length the bigger the
to a lower potential; the higher potential is opposition to the electric current, and also
associated with the (+) sign and the lower depends of A; the cross section area of the
potential with the (-) sign or with the zero material, as bigger the area the smaller the
potential (0) so always the electron goes from opposition to the electric current. The resistance
(+) to (-) or to (0), but always from the high is measured in units of ohms (Ω).
potential to the low potential.
Resistor is an electrical component of electric
Electric current
circuits that reduces the electric current flow, it is
The amount of electrons that flow through a made of different materials, metal film, metal
point (figure 3) at a time (second), is defined as wire wound, carbon film, etc., but we are going
electric current (I) (figure 4), the unit of current is to deal with metal made resistors,
(A) Ampere, so as the current is formed by resistor
electrons, the electric current also flows form (+)
to (-) or to (0).
Fig 3
Electric resistance
The electric resistance is the property of
some materials have to oppose to the flow of the
electric current throughout these materials, and
Fig 4
the ideal