7/28/2019 Alert.docx

http://slidepdf.com/reader/full/alertdocx 1/5

Alert! 

If the two animated pictures 5th, and 6th frame appear frozen, or freeze upafter running a little bit, try moving the mouse, or pressing the shift key

by itself. Failing that, I provide a way to download these two files, so thatyou can see what they look like, using an appropriate viewer, not the

browser, on your machine. Some people have reported that too manysimultaneous animations on older ones fail at the first frame, so you might

try them one at a time, if you're having difficulty. Also some older browsers

cough when more than one animation is presented on the same page, and theyget real sluggish. 

  Fast animated resonant LC circuit 0.031 meg 

  Slow animated resonant LC circuit 0.031 meg  If they work ok, then on with the show... 

Click the "Audio discussion" link Now 

  011_Ls-n-Cs.mp3 Audio lecture on capacitors and inductors 4.33 meg 

7/28/2019 Alert.docx

http://slidepdf.com/reader/full/alertdocx 2/5

 

Click the "Audio discussion" link Now 

  011_RC_RL.mp3 Audio lecture on RC and LC time constants 7.45 meg 

7/28/2019 Alert.docx

http://slidepdf.com/reader/full/alertdocx 3/5

 

Click the "Audio discussion" link Now 

  011_LC.mp3 Audio lecture on resonant LC, circuits 0.67 meg 

The Big Picture:

Think cable :-) 

7/28/2019 Alert.docx

http://slidepdf.com/reader/full/alertdocx 4/5

 

The knob, the shaft, and the whole speedometer, and cable assembly, in this

analogy have no mass at all, thus no inertia. Also for the purposes of this, other

resistance, as further voltage is applied. If we adjust a Variac thatsdriving a nominal 120 volt transformer designed to handle 100 to 200 VA butthe Variac is set to drive it over it's rated voltage, say about 145 volts AC

RMS, we start to see the onset of saturation effects. One obvious thing, isthat the transformer hums louder than usual, but if we connect a low ohm

series resistor, and chart the current, through it by reading the voltageacross it with an oscilloscope we get the following waveform.

The blue portion of the waveform is the normal transformer current the red

bulge is the onset of saturation, and after that point as the voltageincreases, the resistance of the copper wire inside the transformer, is the

only further current limiting factor, because the core is saturated, and can

not accept any more magnetic fields. The more voltage applied bytransformers, the magnetic core material is composed of thin sheets of mild

steel cut into "E" and "I" shapes, sprayed with graphite, an insulator at theminiscule voltages present in the core of a transformer, or inductor. 

7/28/2019 Alert.docx

http://slidepdf.com/reader/full/alertdocx 5/5

 

The magnetic gap is both desirable, for some things, and undesirable for, I

know I used to make custom transformers. 

Yet another way to achieve magnetic gap is the grind up the iron, andsprinkle in some graphite, and a Wizard's brew of other chemicals, bake athigh