>What I am getting at can you safely approximate the fact that the entire
>300W will at some point be dissipated as heat?  Or only a certain
>percentage?

The 300W is what it can deliver as output.  You will draw, on the
input, somewhat more.  The difference is the heat that you will
get.  If it were 100% efficient, it could deliver the power and
there would be no heat.   In the power supply, that is.   Your
300W will show up in the load, in the thing you connected to
the power supply, and if it's in the same box, then you'll get
to dissipate that anyway.

Power factor effects are reactive, and don't become heat.  That's
why they're called "imaginary".

Barry

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