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
>
>
>
|
