ABSTRACT
This chapter discusses the general effect of changes in temperature upon: pure metal conductors, insulators and carbon. Carbon is widely used in the manufacture of contacts used to connect the stationary and rotating conductors of electrical motors and generators. The chapter explains the term temperature coefficient of resistance and explores state the unit of measurement of temperature coefficient of resistance. It also explains the difference between positive and negative temperature coefficients of resistance and describes solve problems on the effect of changes in temperature upon the resistance of materials. In the case of pure metal conductors, such as copper or aluminium, an increase in temperature will cause an increase in its resistance. The temperature coefficient of resistance of most metal conductors is positive, meaning that an increase in temperature results in an increase in resistance. The amount of change in resistance for a given change in temperature, varies from metal to metal.
