Determining the internal resistance of a battery

VP4.1.1.1
Determining the internal resistance of a battery
Determining the internal resistance of a battery

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Description

In the experiment P4.1.1.1, a rheostat as an ohmic load is connected to a battery to determine the internal resistance. The terminal voltage U of the battery is measured for different loads, and the voltage values are plotted over the current I through the rheostat. The internal resistance Ri is determined using the formula

by drawing a best-fit straight line through the measured values. A second diagram illustrates the power

as a function of the load resistance. The power is greatest when the load resistance has the value of the internal resistance Ri.

Components of equipment sets

1 57686  8  Monocell holder STE 2/50 LD
1 57681 Plug-in board safety socket, 20/10 LD
1 68548  8  Mono cell 1.5 V (IEC R20) LD
2 531120  8  Multimeter LDanalog 20 LD
1 53732  4  Rheostat, 10 ohms LD
5 500614  4  Safety connecting lead, 25 cm, black LD

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P4.1.1.1 Determining the internal resistance of a battery
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