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Re: Newbie view: have to be 'politically correct' to assylum insiders or beat up

Posted by Steve Eddy on November 25, 2001 at 01:07:59

In Reply to: Re: Newbie view: have to be 'politically correct' to assylum insiders or beat up posted by john curl on November 24, 2001 at 23:00:46:

Well folks, Steve's latest criticism of me is my use of the word "counter" as in:"... the correction voltage to COUNTER the EMF of the loudspeaker " A dictionary definition is:
" hinder or defeat by an opposing action "

Yes. And in terms of voltage, an OPPOSING voltage is a voltage of the SAME polarity. Voltage is FORCE (that's what the F in EMF stands for). When you want to "hinder or defeat" a particular force, you apply an OPPOSING force. Since voltage is force, if you want to "hinder or defeat" a particular voltage, you apply an opposing voltage. Which must be a voltage of the same polarity as the voltage you wish to oppose.

Consider two identical cars, each facing front bumper to front bumper. Both cars are in Drive. One car hits the accelerator, applying a force in the direction of the second car. If the second car wants to oppose that force, the driver must hit his accelerator. If the second car exerts an opposing force equal to the force the first car is applying, then neither car will move.

It's the same thing with voltage which is demonstrated in the two batteries tied together in the same polarity. Each battery is applying an opposing force against the other battery.

What I was referring to was that negative feedback will create an opposing or opposite voltage to effectively short out any extraneous voltages from the loudspeaker.

Er, can't have it both ways. An opposing voltage is an opposite voltage. Just as an opposing force is an opposite force. And two opposing/opposite voltages will be voltages of the same polarity.

Here, perhaps this will help:

The arrows indicate the direction of force. And as you can see here, the forces/voltages are opposing/opposite/counter to each other.

Now if you want to "short out" a voltage, you can do that. Just flip one of the batteries around. Like this:

This will achieve the shorting you want, but it's not by way of any opposing/opposite/counter voltages. But rather COMPLIMENTARY voltages. Complimentary voltages do not oppose/counter one another.

Steve apparently thought that I was attempting to block any extraneous current flow from the loudspeaker.

What I thought was what you claimed (Jon was the one who brought up "counter current" by the way). You claimed a voltage is generated to COUNTER EMF. Now whether you call it a counter voltage, or an opposing voltage, or an opposite voltage, they all mean the same thing. And that is a voltage of the same polarity as the voltage you're wanting to counter/oppose.

Had you said a complimentary voltage is generated, or a voltage of an opposite polarity (which is not synonymous with an opposing/opposite voltage, which would be of the same polarity), that would have been another matter. Not that I would have entirely agreed (the amplifier isn't really generating any voltage), but I wouldn't have taken issue with the main thrust of your claim.

se

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