Electric Conductivity, Resistance and Ohm’s Law

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https://www.electronics-lab.com/article/electric-conductivity-resistance-and-ohms-law/

Introduction Consider a piece conductor in the shape of a cylinder with a voltage applied across its ends, as depicted in Figure 1. When a potential difference (voltage ∆V) is applied between two points in a conductor, an electric field E is created, and free electrons (e–) in the conductor feel a force due to the electric […]

Ohm’s Law

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https://www.electronics-lab.com/article/ohms-law/

Introduction The fundamental relation between the current, voltage, and resistance is known as Ohm’s law and is probably the most famous and elementary physical law of electronics. It is in 1827 when the German physicist Georg Simon Ohm publishes for the first time in the book “Die galvanische Kette, mathematisch bearbeitet” (in English: The mathematical […]

Conductivity Shield for Arduino Uno

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https://www.electronics-lab.com/conductivity-shield-arduino-uno/

by PyroCat @ elektormagazine.com: Conductivity is the ability of a material to transfer electrons. It is the opposite of the concept of resistivity which is well known to electricians. However, while we are used to address the topic of conductivity in the field of electronics, things get a little bit more complicated when we try […]

‘Circuit Cobbling’ the Riffle Data Logger

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https://www.electronics-lab.com/48276-2/

John Keefe has designed an open source data logger that is able to monitor conductivity, temperature and turbidity of water in lakes and fits inside a plastic bottle. The board is designed to monitor the conductivity (and, possibly, contamination) of water in lakes and streams, with the wonderful feature that it fits through the mouth […]