IB Physics HL B 5 14 Emf and Internal Resistance Questions

Practise IB Physics HL B.5.14 by modelling real cells, extracting internal resistance from data, and analysing power and energy transfer.

Exam points

Interpret the gradient of a world-line as velocity and identify light-cone limits.
Use world-line diagrams to compare speeds, directions and event relationships using complete evidence.

[Maximum number: 4]

This question is in two parts

The plates in (c) are replaced by a cell that has an emf of 12.0 V and internal resistance $5.00 \Omega$ . A resistor of resistance R is connected in series with the cell. The energy transferred by the cell to an electron as it moves through the resistor is $1.44 \times 10^{-18} \mathrm{~J}$ .

Show that the value of R is $15.0 \Omega$ .

pd across $R=\frac{1.44 \times 10^{-18}}{1.6 \times 10^{-19}}=9.00 \mathrm{~V}$ ;
pd across internal resistance $=12.0-9.00=3.00 \mathrm{~V}$ ;
current in circuit $=\frac{3.00}{5.00}=0.600 \mathrm{~A}$ ;
$R=\frac{9.00}{0.600}=15.0 \Omega$ ;

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IB Physics HL B 5 14 Emf and Internal Resistance Questions question 1