R. Fehr

Articles by R. Fehr
Harmonics Made Simple
Just because harmonics is becoming a more prevalent problem, that doesn't mean the subject is getting any easier to understand
The Trouble With Capacitors Part 2
Here's how to reduce the effect of capacitor switching on your power system
The Trouble With Capacitors Part 1
Although shunt capacitors offer several advantages at all voltage levels, those advantages come at a price ...
The Basics of Ladder Logic
Ladder logic is the basis of most control functions
Meter Basics
Meters are indispensable when working with electrical systems
The Basics of AC Motors 1
Powering industry since replacing the steam engine
The Basics of Transformers
By raising and lowering voltage levels, transformers make power systems versatile
The Basics of Parallel Circuits
Components in parallel share current, but not necessarily equally
The Basics of Power Factor and Efficiency
You don't always get what you pay for
The Basics of Capacitance
Last month's column explained that AC current flowing through an inductance reaches its peak amplitude after the voltage. Lagging current is characteristic
The Basics of Inductance 1
Inductance is the link between electric circuits and magnetic fields.
AC Fundamentals
Alternating current circuits improve the versatility and usefulness of electric power systems
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