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1. An electrical insulator is a material whose internal electric charges do not flow freely, very little electric current will flow through it under the influence of an electric field. This contrasts with other materials, semiconductors and conductors, which conduct electric current more easily. The property that distinguishes an insulator is its resistivity, insulators have higher resistivity than semiconductors or conductors.
2. This is a materialof such low conductivity that electricity cannot go through. Insulating material, oftenglass or porcelain, in a unit form designed so as to support a charged conductor and electrically isolateit.
Electric power, Electricity
https://en.wikipedia.org/wiki/Insulator_(electricity) (1.); http://dictionary.cambridge.org/de/worterbuch/englisch/insulator (2.)
Author: Laura Saupe