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RE: Insulators Can Conduct Current , Electron and Band thoeries
Because an insulator can also conduct electricity, that is why we have insulators usually rated by the maximum amount of voltage they can withstand without breaking down. For instance, a friend just bought an insulating glove capable of handing up to 9KV. Voltages higher than that may be risky to use such a protection device to work on it.
Yes you are right. Its termed R-value which is the which is a value that determines how objects resist the flow of current. Higher the R value larger the resistivity. Thanks for stopping by