ac and dc

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The question is one I have often wondered about myself and although I know you have devices to inject DC on an AC supply and they are used with stone crushing plants I have never really studied them to find out what exactly they are for.
Of course we have the same in our home where we want to power an amplifier on an aerial mast and it sends AC down the coax at the same time as DC is sent up to power the device.
We have two components the inductance and the capacitance the first will allow DC to pass and not AC and the second is the reverse.
However the question was rather open and really a little more is needed before one goes deep into the answers.
Could of course be completely wrong and may be he was asking about
200px-ACDC_-_Toronto_November_7%2C_2008.JPG
 
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Kev, asking basic questions then insulting forum members is one thing, but this is not the place for making offensive comments about the greatest Rock 'n' Roll band the world has ever seen.

Buy yourself a basic electrical theory book and a copy of "For those of you about to rock (we salute you)".
 
:eek: :rolleyes:
This conveyor that shakes, would it shake enough to encourage say an aeroplane to take off of it ??? ;)
 

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