In the lesson Classifying matter as conductors and insulators bassed on their electrical conductivity, a simple electric circuit is made, consisting of a battery, connecting conductors (wires), light bulb and various bodies that allow or do not allow the passage of electric current. If the light bulb lights up, then the body connected in the circuit conducts the electric current, and if the light bulb does not light up, then the connected body does not conduct the electric current. One of the materials below is not a conductor: the copper aluminum the graphite glass