# Category Archives: Electronics

## Computing Useful Customer Analogies

Introduction Communicating scientific concepts to the public is a tough problem. One of the major issues is that people have a difficult time imagining the relative scale of things — just try to think of 1000 of something versus 10 … Continue reading

## Lightning Protection Math

Introduction I get asked a lot of questions about the specific values that are used in engineering standards. At some level, you just meet the required values in these standards. You do not need to know why they were set … Continue reading

## Calculator to Select Connector for Joining Wires

Introduction I have written dozens (hundreds?) of small Mathcad function to help me in my daily work. Since I plan to teach another Mathcad class soon, I am gathering examples that might be good to use as application examples. Yesterday, … Continue reading

## A Couple of Examples of Characteristic Impedance Calculations in Mathcad

Introduction I have been doing some work that involves computing the characteristic impedances of cables. The work has involved creating some tables in Mathcad for comparison with tables from a government specification. Since I am always looking for real-life computations … Continue reading

## Epidemiology and Cell Towers

Introduction I received a phone call from a cancer epidemiologist last Friday. He had received my name from a co-worker in his department who knows me. This researcher is in the process of researching a cancer cluster near a cell … Continue reading

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## Phone Line Impedance Levels: 600 Ohms and 900 Ohms

Introduction Engineering is a pretty conservative profession — I have been accused of “abhorring change”. Once something gets standardized it stays in place even when it does not make sense. This morning provided me a good example of this. Phone … Continue reading

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## Engineering Application of Conformal Mapping

Introduction I have a project that I am working on that involves the use of conformal mappings. I have long found the use of complex numbers in electrical engineering interesting. My first contact with an engineering application of conformal mappings … Continue reading

## Battery Life Dissipated Under Varying Temperature Conditions

Introduction I am not getting any younger. As I age, I have come to realize that certain activities age me faster than others. For example, I have no doubt that sitting in meetings for hours every day has deleterious effects … Continue reading

## Battery Freezing Math

Introduction I live in a cold climate — so cold that under certain circumstances we can freeze our lead-acid batteries. A customer who lives in my region called recently and was wondering if I thought any of his batteries would … Continue reading