DETERMINATION OF SPECIFIC ELECTRICAL RESISTANCE OF WALNUT CHARCOAL

The article presents the results of experimental determinations of the electrical and resistivity of coal powder and a briquette of walnut charcoal and data of comparisons with the electrical conductivity of a graphite single crystal. Coal powder and briquettes have a lower electrical resistivity (8 Ω• mm²/m and 7 Ω• mm²/m) as compared to the electric resistance of C axis graphite single crystal. This is due to the fact that coal briquettes and tablets from charcoal powders are obtained by extrusion and pressing in the mold. It has been established that the resistivity of the powder and the briquette and the current-voltage characteristics are different. It is shown that with an increase in the temperature of the composite, the resistivity also increases.