#4.2.4a
(i) resistivity of a material; the equation \(R = \dfrac{ρL}{A} \)
(ii) techniques and procedures used to determine the resistivity of a metal.
PAG3
#4.2.4b
the variation of resistivity of metals and semiconductors with temperature
#4.2.4c
negative temperature coefficient (NTC) thermistor; variation of resistance with temperature.