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Principle
If two different metals are in contact, a contact potential results from the different electron affinity of the metals' surfaces. The size of this potential is a function of the temperature since the electron's kinetic energy increases with increasing temperature.
These potentials also occur when the thermocouple is connected to a voltmeter. However, they cancel each other (i.e., they do not falsify the measuring results) if both leads which are connected to the meter are of the same material.
A thermocouple consists of a pair of different metals, e.g. iron and constantan. If the two contact points have different temperatures, the difference between the contact potentials can be measured as thermo potential.
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- Real stand material for an esecially stable and safe setup
- Student-suitable experiment descriptions with reports available
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Article no. 07122-00
1
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Digital learning
(en) Experiment guide
p1042400e .pdf
File size 0.76 Mb
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(de) Versuchsbeschreibung
p1042400_de .pdf
File size 1.66 Mb
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(es) Versuchsbeschreibung
p1042400_es .pdf
File size 1.60 Mb
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(ru) Versuchsbeschreibung
p1042400_ru .pdf
File size 1.82 Mb
pdf
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Temperature measurement with a thermocouple
- .H5P
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.H5P
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