THE electrical conductivity of an electrolyte is determined by its ion concentration. The effect of dispersed solid particles of a comparatively low conductance, such as proteins, can be taken ...

Electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm, while electrical conductance is measured in siemens (S).

Now, the outside of electric wires are usually covered in plastic because it’s a very poor conductor. It hardly conducts any electricity at all, so we can say it’s an electrical insulator.