Apr
15

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dirac features

Paul Dirac and his wave equation

It has been said of Paul Dirac (1902-1984) that he was able to conjure laws of nature from pure thought. His method was not experimental, but instead theoretical….

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Apr
15

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featured lightning

Lightning and its myths

In many ancient mythologies, lightning and the associated thunder crash were seen as mechanisms for divine retribution. Though we are well beyond that view, the public still has…

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Apr
10

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Pauli

Wolfgang Pauli and the exclusion principle

Simply stated, the elementary particles that constitute matter are fermions and the elementary particles that constitute energy are bosons. Fermions have half-integer (1/2, 3/2, 5/2 …) spin while…

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Apr
10

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Heisenberg

Heisenberg and the uncertainty principle

Werner Heisenberg (1901-1976) propounded (as applicable to quantum mechanics) his Uncertainty principle in 1927. It stated that there is a fundamental limit to the precision with which certain…

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Apr
7

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planck

Planck’s Constant and discrete energy levels

Planck’s constant is 6.62606957 × 10-34 m2 kg/sec. Notice the -34 exponent. That means it is an extremely small number. To see how this plays out, we must…

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waveguide featured

Basics of waveguides

Monday, March 23, 2015

There is something almost comical about a waveguide – the notion that electromagnetic signals or usable power could pass through a hollow pipe and that techniques appropriate to…

oliver heaviside

Oliver Heaviside and Maxwell’s equations

Friday, March 6, 2015

Oliver Heaviside’s life, spanning the years 1850 to 1925, began and ended in squalid surroundings. He was never entirely free of the dark melancholy that characterized his private…

keithley handbook

Answer this 5-question quiz, win a measurement handbook

Thursday, March 5, 2015

What’s your test IQ? Answer this five-question quiz and be entered to win one of 20 Low Level Measurement Handbooks graciously donated to us by Keithley Instruments, a…

VFD simple schematic

Variable Frequency Drives: Viewing the DC Bus

Thursday, September 25, 2014

By David Herres In the field of motion control it’s often necessary to vary the speed of an electric motor and even reverse its direction of rotation. When…