dielectric – מילון אנגלי-אנגלי
dielectric
adj.
of or pertaining to a dielectric substance, of or pertaining to a material that does not conduct electricity
n.
insulator, material that does not conduct electricity
Dielectric
A
dielectric material (
dielectric for short) is an electrical
insulator that can be
polarized by an applied
electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in a
conductor, but only slightly shift from their average equilibrium positions causing
dielectric polarization. Because of dielectric polarization, positive charges are displaced toward the field and negative charges shift in the opposite direction. This creates an internal electric field that reduces the overall field within the dielectric itself. If a dielectric is composed of weakly bonded molecules, those molecules not only become polarized, but also reorient so that their symmetry axes align to the field.
dielectric
Noun
1. a material such as glass or porcelain with negligible electrical or thermal conductivity
(synonym) insulator, nonconductor
(hypernym) material, stuff
(hyponym) bushing
Dielectric
(n.)
Any substance or medium that transmits the electric force by a process different from conduction, as in the phenomena of induction; a nonconductor. separating a body electrified by induction, from the electrifying body.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
dielectric
1. A substance in which an
electric field may be maintained with zero or near-zero
power dissipation,
i.e. , the electrical conductivity is zero or near zero.
Note 1: A dielectric material is an electrical insulator.
Note 2: In a dielectric, electrons are bound to atoms and molecules, hence there are few free electrons.
2. Pertaining to a substance that has a zero or near zero electrical conductivity.
