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Voltage, Current, Resistance Concepts and Units

You're welcome to download, read, share, and even reuse it under the CC by-sa license. If it helps you, please consider citing it where you use it – that makes a big difference. If you can afford it, buying the paid pdf or printed edition supports the project and keeps it sustainable. (Right now, about 1 in 400 readers do – thank you if you're one of them ) Enjoy the book – it was a joy to write and share by Olivier Cleynen ISBN: 9781446710067 First edition in English (June 2025), Olivier Cleynen / thermodynamicsbook com Translated from the third edition of the French original [51] Copyright 2015, 2018, 2021, 2025 Olivier Cleynen Engineering Thermodynamics is released under a Creative Commons license: c b a Attribution – Share-Alike 4 0.

Key Points

  • If voltage is forced to some value V, then that voltage V divided by measured current I will equal R.
  • The current I is adjusted to reestablish the balance position.
  • A resistance thermometer is included in a circuit that measures the thermometer's electric resistance.
  • Ohm's law states that in a well-behaved conductor (a so-called ohmic conductor), the electric current between two points is directly proportional to the voltage (the difference of electric potential) across the two points.
  • Ohm's law is an empirical relation which accurately describes the conductivity of the vast majority of electrically conductive materials over many orders of magnitude of current.
  • The power of the compressor is 190 times larger than that of the pump in the previous example.

Terms

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