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IB Physics HL B 5 1 Cells Provide a Source of Emf Questions

Practise IB Physics HL B.5.1 by defining emf and calculating energy supplied per unit charge by a cell.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Relate emf to work, energy and power supplied per unit charge through a complete circuit.
  • Infer emf from electron energy, charge or cell readings and distinguish it from terminal potential difference.

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Study B.5.1—Cells provide a source of emf conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL B 5 1 Cells Provide a Source of Emf Questions question 1

[Maximum number: 1]

A cell is connected to an ideal voltmeter, a switch S and a resistor R. The resistance of R is 4.0Ω4.0 \Omega.

Figure for Question IB Physics HL B 5 1 Cells Provide a Source of Emf Questions question 1 — IB Physics HL

When S is open the reading on the voltmeter is 12 V . When S is closed the voltmeter reads 8.0 V .

State the emf of the cell.

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