Physics A-Level
Proportional reasoning about length and area
What Proportional reasoning about length and area means in Physics A-Level, as defined for OCR.
Definition of Proportional reasoning about length and area
Check what you remember
Read the wording for your board, then hide it and explain Proportional reasoning about length and area in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Doubling L doubles R, and doubling A halves R, for a fixed material.
Topics that use Proportional reasoning about length and area
- Resistivity (OCR A-Level)
Related terms
- Charge-carrier release in semiconductors
- Choice of measuring instruments
- Experimental determination of resistivity
- Graphical interpretation of ρ against T
- Microscopic model of conduction in metals
- ntc thermistor
- Resistivity
- Semiconductor charge-carrier model
Using Proportional reasoning about length and area in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
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