When it comes to calculations, the most useful ability is not to be able to
caculate it exactly, caculator or no, but to quickly be able to
estimate a ball
park answer or approximation.
Who needs to know that 22uH at 137kHz has 18.93 ohms reactance.
Its quicker to think " a bit more than 20 times a bit less than 0.14, times
6-and-a-bit
... is 2.8 times 6-and-a-bit , so call it 18 ohms"
And they don't teach that in schools - and never have done, to my knowledge!
Andy G4JNT
On Friday, November 19, 2004 4:01 AM, WE0H Mike
[SMTP:[email protected]]
wrote:
> Yes, you have to know what buttons to push to get the right answer. The
> calculator just helps you to not make as many mistakes if any at all.
>
> Mike
> WE0H
>
> G4gvw wrote:
>
> >I must confess that after all these years i do find that my
> >calculator
with
> >
> >all the built-in formulae (ohms law included) has made me lazy but
maybe the
> >
> >skill is in knowing what to calculate and when
> >
> >Pat g4gvw
> >
> >
> >
