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PAG 4: EMF and Internal Resistance

Investigate the EMF and internal resistance of cells and batteries

Required PracticalOCRA-Level

🔬 Equipment Required

  • Cell or battery
  • Variable resistor (rheostat)
  • Ammeter
  • Voltmeter
  • Connecting wires
  • Switch
  • Fixed resistors (various values)

🦺 Safety Precautions

  • Do not short circuit the cell
  • Use low currents to prevent heating
  • Monitor cell temperature
  • Disconnect when not in use

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About PAG 4: EMF and Internal Resistance

PAG 4: EMF and Internal Resistance is a required practical for OCR A-Level Physics. This practical investigate the emf and internal resistance of cells and batteries

Students are expected to understand the method, identify and control variables, use appropriate equipment, analyse results, draw graphs, identify sources of error, suggest improvements, and consider safety precautions.

Questions on required practicals frequently appear in OCR A-Level Physics exams and can be worth significant marks. Practice with our AI-generated questions to master this practical.

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