50g

> { 'V=I*R' 'P=V*I' 'P=I^2.*R' 'P=V^2./R' }
>
> I see this as a list of equations for ohms law and the first on in the
> list is the one that comes up when starting. My question is how do I
> change to the second or third formula in the list or is it possible to
> do so. I bought the 50g used and it's possible that the previous user
> entered this equation.

You'd have to delete the first one manually using edit and then it
would show.

However, I can tell you with 100% certainty that the previous owner
didn't enter those in. They were using the equation library. If you
press APPS and scroll down, you will probably see at number 13 or 14
"Equation Library". (if you don't find it, install the library from
here: http://www.hpcalc.org/details.php?id=6515) Select that, then
press F1 for EQLIB then F1 again. You will now be in a full screen
browser.

Move to electricity, press ENTER, then Ohm's Law and power, you can
now use the up and down arrow to view the equations in this set, VARS
will tell you what they are, etc.

Once ready, press SOLV. Now now you will see V I R P and ALL on the
menu. Type 120 and hit V. Notice the units are automatically
assigned. Hit 20 and I. Then press left shift P. After a second,
your W will pop out.

In other words, it iterates through the equation set, solving as you
go along, and keeping the units straight as you go!

Chapter 5 of the AUR details all of the equations and everything else
you'll find in the equation library. Other usefull commands in
relation tho this are MINIT (initialize MES) and MSOLVR (return to old
previously setup MES).

TW