The internal resistance of a voltage source

Article no. P1373200 | Type: Experiments

10 Minutes
10 Minutes
grades 7-10
Pupils
medium

Principle

A commercially available dry battery or single cell is extremely suitable for this experiment on the internal resistance of a source of voltage. It has an internal resistance which is high enough to be measured well, and it can be easily replaced if inattentiveness should cause it to be destroyed by too long exposure to an overload.

The power supply is not suitable for this determination of internal resistance because it is voltage stabilised. 

Benefits

  • No additional cable connections between the building blocks needed - clear arragned and quick setup
  • Contact saftey due to puzzle blocks system
  • Corrosion-free gold plated contacts
  • Doubled earning sucess: Electric circuit diagram on top, real components can be seen unterside

Tasks

Do voltage sources also have a resistance?

Connect resistances of various sizes in a circuit, then examine the internal resistance of the voltage source Ri by measuring its current I and terminal voltage UT.

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Digital learning
(en) Experiment guide
p1373200e .pdf
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(de) Versuchsbeschreibung
p1373200_de .pdf
File size 1.54 Mb
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The internal resistance of a voltage source
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