A-Level Physics OCR A H556

4.2.4: Resistivity

#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.

4.2.3

Resistance

4.2.5

Power