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Electrical properties
Materials can behave in different ways when an electric field is applied. By the way they conduct electricity, materials can be classified in conductors, semiconductors and insulators. Metals are usually
good electrical conductors because they have many free electrons that act as carriers of electricity and thus facilitate the flow of an electric current. Insulators (most ceramics, glasses, wood and plastics)
oppose the flow of a current because they have very few free carriers (no carriers - no flow!). Semiconductors (silicon, germanium, galium arsenide, etc) are an intermediate case
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