Exercise EE1-03.02 – D cell

Prof. Dr. Thorsten Jungmann (last updated 2025-10-27)

Relates to EE1-03 Sources

Task

A D cell has the open-circuit voltage $U_0=1.5\mathrm{V}$ and the short-circuit current $I_{\mathrm{sc}}=1.9\mathrm{A}$. What terminal voltage $U_{\mathrm{t}}$ results when the current $I=0.19\mathrm{A}$ is drawn from it?

a) Sketch the equivalent circuits for the linear voltage source and the linear current source.

b) Calculate the elements of the equivalent circuits.

c) Draw the I-U characteristic curve of the linear source.

d) Determine the terminal voltage specified in the task by calculation.

e) Determine the terminal voltage specified in the task graphically and compare the result with the result of the calculation in d).

Solution

a) Sketches
b) $0.79\Omega$ / $1.3\mathrm{S}$
c) Characteristic curve
d) $1.35\mathrm{V}$
e) The results agree

▶️ Full worked solution