Variable frequency drives are widely used to control the speed of ac motors.  This note looks at the mechanisms which enable drive units to control the...

Years ago I was told that you should always try to write the best report you can.  Many years later I still think on this as one of the better pieces of...

Exposure to time varying magnetic fields, from power frequencies to the gigahertz range can have harmful consequences.  A lot of research has been conducted...

It wasn't so long ago I was telling someone that I don't use rules of thumb as most things are easily calculated anyhow.   As it turns out I last week...

Lamps are the essential part of any luminaire. These are the light generating components. Since the advent of electrical lighting in the middle of the...

We have had the Wiki with us for a long time now, but at last I have decided to say bye bye – more details on why below.

I have been thinking recently that there appears to be less professional integrity around than when I first started my career in electrical engineering...

Collection of links to various places with useful motor information. I’ll try and return to the page every now and again to update it with any motor notes...

If you want to check a circuit is dead (not live), you should always use the three point method. First check a known live circuit, then check the dead...

When current flows within a wire, a magnetic field is created. The potion of this magnetic field perpendicular to the wire is called the magnetic flux...