1. Which among the materials are good conductors of electricity? Can all materials which conduct electricity also conduct heat? Explain your answer.
2. How can you say that a material is a good conductor of heat and electricity? Give some characteristics of a good conductor of heat and electricity.
3. Which among the materials are poor conductors of electricity? What is your proof or evidence?
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Answer:
1.Graphene has emerged as one of the most promising nanomaterials because of its unique combination of superb properties: it is not only one of the thinnest but also strongest materials; it conducts heat better than all other materials; it is a great conductor of electricity; it is optically transparent, yet so dense .
2.Metals are good conductors (both of heat and electricity) because at least one electron per atom is free: i.e., it is not tied to any particular atom, but is, instead, able to move freely throughout the metal. Low resistivity high conductivity. Low temperature coefficient of resistivity.
3.Materials like glass and plastic are poor electrical conductors, and are called insulators.
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