In message , Dave W
writes
On Fri, 11 Oct 2019 19:03:34 +0100, Terry Casey
wrote:
Snip
When the subject of yolerance came up elsewhere a while ago I
devised this table to illustrate the tolerances of different
eanges of resistor. Feel free to show it your students.

https://www.dropbox.com/s/qdeyfp7lzzdsrdr/Resistor%
20Tolerances.png?dl=0

or https://tinyurl.com/y2jdjh7o

--

Terry

That's rather good!

20% resistors were a bit before my time but the chart demonstrates what
I always thought about the apparently strange value choices.

Make a batch of carbon resistors...... test for value and designate a
fit in one of the available bands. No wastage:-)

--
Tim Lamb