magnets and producing electricity

[Nemesiswes]

Hey I figured this was the place since it does have to do with magnet's and so the question is that I know in generators that they have tw differn't magnetic poles, North and South and when it spins these alternating magnetic fields cause a voltage in a wire and thus current flow. So what if you made one with only one pole facing the generator. So it would have the north side of the magnets always facing the rotor and so what i'm trying to ask is that is it possible to induce a voltage in a wire if you only have magnetic north poles facing it, i kind of don't think you could because there is no alternating field and the most i think could happen is that it might just induce a voltage but it would only be + or -. it might look like ripple dc?
I really hope someone on here can straighten all this out for me    
thanks for any help

[Roen Hayden]

Is this waht you asking?

Is it possiable to get electricity from the magnetic field its self with out puting any energy into the device?

[cassiusml]

I believe the variance of magnect flux is what generates the eletric current in a wire

[Koen1]

No, what I think he is asking is this:

Can you use a dipolar dynamo design and simply turn one rotor magnet around so that it no longer creates a flux path between the magnets?

well, I guess that depends on what type of dynamo/generator you are using.

If you're using the most simple dynamo it would be a loop of wire which rotates along the side axis (the 12 o'clock - 6 o'clock line) while a magnetic field lies perpendicular to the axis (so that would be the 3 o'clock - 9 o'clock line). If you were to turn one magnet around, the induced current would still flow from the axis to the 'top' of the loop on one side (say the 'left'), but on the other (say the 'right') the induced current would also flow from axis to 'top', which would of course result in a zero current between the two wires at the axis (where one would normally get the current in such a design). So in this design it would result in a zero induced current.

But there are also generators that use a different setup. Versions of the Muller generator for example, use magnets that all face the same way, and a wheel with coils that spin so that the cils are aligned with the magnetic fields periodically, and the variations in flux that the coils 'see' induce a current.
So here there we have a different setup...

But in any case, the induction of current in a conductor moving through a magnetic field is obviously always related to the spin contained in that field.
And a field has poles. If there were not two opposing poles, there would not be a magnetic field, and induction effects would be zero.
I think.

[Roen Hayden]

Is this waht you asking?

Is it possiable to get electricity from the magnetic field its self with out puting any energy into the device?

Is it even remotely possible to do what I asked?