GoTEK SFR1M44-U100...

[Tony Duell]

On Fri, Jul 20, 2018 at 5:06 PM, Dave Wade via cctalk
<cctalk at classiccmp.org> wrote:
>> -----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......

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...

> 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