Learning objective
Explain how length and cross-sectional area affect resistance.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Current electricity
Subtopic
Resistivity
Aqa A Level PhysicsElectricity
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Quick explanation
Explain how length and cross-sectional area affect resistance
- This point belongs to Current electricity, especially Resistivity.
- You need to be able to explain how length and cross-sectional area affect resistance.
- The key ideas to know are resistance, length, and cross-sectional area.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
resistancelengthcross-sectional area
Why it matters
This objective helps connect Resistivity to exam-style questions, flashcards, and revision notes for Current electricity.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Use current as the rate of flow of charge.
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- Use potential difference as energy transferred per unit charge.
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- Apply Ohm's law to suitable conductors.
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- Use electrical power and energy equations in circuit contexts.
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- Interpret I-V graphs for ohmic conductors.
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