Physics A-Level
Resistivity
What Resistivity means in Physics A-Level, as defined for AQA, OCR.
Definitions of Resistivity
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Reference: AQA
Defined by ρ = RA/L, where R is resistance, A is cross-sectional area and L is length, with unit the ohm metre (Ω m).
A property of the material itself, not of a particular specimen, defined by R = ρL/A and rearranged as ρ = RA/L.
A material property which falls to exactly zero at and below the critical temperature in certain materials.
Topics that use Resistivity
- Resistivity (AQA A-Level)
- Resistivity (OCR A-Level)
Related terms
- Experimental determination of resistivity
- ntc thermistor
- Charge carriers and scattering
- Charge-carrier release in semiconductors
- Choice of measuring instruments
- Graphical analysis using gradients
- Graphical interpretation of ρ against T
- Magnetic field generation
Using Resistivity in the exam
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