20 Jul
2018
20 Jul
'18
9:17 a.m.
On Fri, Jul 20, 2018 at 5:06 PM, Dave Wade via cctalk
<cctalk at classiccmp.org> wrote:
Or quote far too many significant figures. I had an idiot who was asking
for a resistor accurate to 8 significant figures or something. Turned out
it was the series resistor for an LED.... As I said, an idiot...
-----Original
Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of dwight via
cctalk
Sent: 19 July 2018 22:17
To: Liam Proven <lproven at gmail.com>; General Discussion: On-Topic and
Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: GoTEK SFR1M44-U100...
One thing that bothers me is the continued emphasis on arithmetic and not
on mathematics. The kids growing up today will rarely be more than a few
feet from a calculator. The first thing on the math test was the "No
calculator
allowed". I'm not saying that they
shouldn't be taught arithmetic but it
should
be the minimum necessary to recreate a
multiplication, square, divide or
what ever table. Knowing what 43 * 67 is on an exam is useless in
determining if the kid can learn calculus or understand how it relates to
the
real world.
All too often they put the numbers in blindly, mis-type, and get a silly
answer...... They need enough to know that the answer to that
calculation will be
somewhere
between 2400 and 3500 and probably be able to tell me its likely to be near
40 X 70...
... so take 43 + 5 * 67
... well the windows calculator gives 3216 in standard mode and 378 in
scientific mode....
Or I'm debugging something. I measure the voltage across a resistor as
13.7V. A check with the schematic or the colour bands on the resistor
shows it's a 1.5k Ohm one. So I think 'That means there's a little under
10mA flowing, is that reasonable?'. To have to stop, type the numbers into
a calculator and get 9.13333..mA would take longer and not tell me anything
more in most cases.
-tony