'X' is a type of commercial resistor made from a mixture of clay, carbon black, and resin binder which are pressed and then molded into cylindrical rods by heating. Identify X.

MCQs on electric current, ohms law and its limitations, electrons drift and resistivity origin, various materials resistivity, electrical energy and power, resistivity temperature dependence, resistors combination, cells, emf and internal resistance, kirchoffs law, potentiometer, wheatstone and meter bridges.