> So with a working circuit such as this:
>
>                          ------IRLZ24-------
> +12V <-------| FAN |-----DRAIN  GATE  SOURCE---------- GND
>                                   |
>                                   |
>                                   |
>                                  Logic input
>
> would it be correct calling this a low-side switch?

        That would be correct.

> Is it
> possible to convert
> it to a high side, since I'm hoping to use the IRLZ24's as a
> power switch for
> my supply.. ie:
>
> +12V <------ (IRLZ24) ----- LOAD ---- GND

        Although "possible" I would STRONG recommend against it. The reason is in
this config you are using the MOSFET in source follower config. Why this is
bad is power dissipation, the MOSFET will drop a rather large amount of
voltage and probably burn up (if you are running at "rated" current). This
is due to the transistor not being fully "on" (hard in the triode region).

> I hope I haven't mixed up my high/low side terminology. Would I need a P-
> channel for this application?

        Correct, you need a p-ch to do this properly. TTYL

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