[sdiy] really basic question .. tolerance

[Peter Grenader]

I wrote this letter a while ago, but haven't seen it onthew list.  If you
all got it (now again), my apologies.

<< tolerance are connected in series that the result will be out of
tolerance?>>

<<Please show me an example of two 1% resistors in series or parallel where
 the tolerance exceeds 1%. I heard this rule many times but I can't see
it.>>

I haven't read all the replies in this string, so I can only respond to what
I said originally: 

"Be careful of accumulative tolerances."

Meaning: the amount from the actual value of each resistor will be summed as
well. I didn't mean to imply anything about them suddenly being out of
tolerance.

I guess if you needed 1% and one of the two you used in series was a 20%,
depending on the summed value you could be headed for trouble but obivously,
if the tolerance amount doubles in the series config, so does the base
value, so the % from nominal is constant.

P