Cambridge AS & A Level Physics
9.3Resistance and resistivity
Resistance and resistivity in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic45 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 9.3.1Define resistance.
- 9.3.2Recall and use V = IR.
- 9.3.3Sketch I-V characteristics of a metallic conductor, a diode and a filament lamp.
- 9.3.4Explain why a filament lamp's resistance rises with current.
- 9.3.5State Ohm's law.
- 9.3.6Recall and use R = ρL/A.
- 9.3.7Recognise that an LDR's resistance falls as light intensity rises.
- 9.3.8Recognise that an NTC thermistor's resistance falls as temperature rises.
Lessons
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Resistance, Ohm's law and I-V characteristics
45 min
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Resistivity of materials
40 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
Turn Resistance and resistivity into a strength.
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