IB Physics SL B.5.1 Cells provide a source of emf

Learn to define emf precisely and use simple circuit information to identify the energy transferred per unit charge by a cell.

Syllabus
First assessment 2025
Objective
—
Level
SL

Exam points

  • state emf as energy transferred per unit charge and give the correct unit as volts or J C^-1
  • read a simple circuit diagram or data table to state the cell emf from the labelled potential difference

B.5.1—Cells provide a source of emf question 1

[Maximum number: 1]

This question is in two parts. Part 1 is about a thermistor circuit. Part 2 is about vibrations and waves.
Part 1 Thermistor circuit
The circuit shows a negative temperature coefficient (NTC) thermistor X and a 100kΩ100 \mathrm{k} \Omega fixed resistor R connected across a battery.

Figure for Question B.5.1—Cells provide a source of emf question 1 — IB Physics SL

The battery has an electromotive force (emf) of 12.0 V and negligible internal resistance.

Define electromotive force (emf).

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