If by "poor" you mean that reluctantly carries a small charge, that you may want a resistor. A resistor is an electrical device that reduces the voltage of a current.
It is due to the availablity of "free electrons". All metals such as Copper can be considered as atomic nuclei surrounded by a "sea" of electrons which are free to move around with little resistance,...
Because Silica is Siliconedioxide and silicone and oxygen both are non metals and its is a physical property of a non metal to be poor thermal and electrical conductor
An electrical insulator is a material that resists electric current, and will not allow it to flow easily. Examples include glass and most ceramics. An electrical conductor is a material that offers...