This post is quick introduction and overview to different railway electrification voltages used in answer to a question sent in via email. While there...

Multimeters are undoubtedly the most common item of electrical test equipment in use.  Often it is the first piece of equipment people will turn to when...

Everything physical in electrical engineering from insulations to conductors revolves around materials. Here we are listing common materials along with...

A recurring theme on our forums is cable sizing. Now many installations are unique and require special consideration. However, a lot of the time things...

Motor starting and its associated problems are well-known to many people who have worked on large industrial processes. However, these things are, of course...

Electrical notes are a collaborative collection of electrical engineering information and educational material. Any registered user can add content. ...

"I can live with doubt and uncertainty and not knowing. I think it is much more interesting to live not knowing than to have answers that might be wrong...

The term 'N+1' relates to redundancy and simply means that if you required 'N' items of equipment for something to work, you would have one additional...

Estimating maximum demand is a topic frequently discussed. Working out how much power to allow for a building can be very subjective . Allowing too much...

This is the first of two posts on the resistance of conductors. In the next post I will look at the ac resistance, including skin effect and we deal with...