1445326735900-0

On the boards
we would get:
and this is the formula for parallel resistors. Let’s try it out
on the resistors of this last experiment. Putting in the values,
10 k and 1k5 we get:
which is about 1k3, the measured value.
This is the law of parallel resistors, every bit as important as
that of series resistors. Remember it!
If there are only two resistors in parallel, you don’t have to
calculate it the way we’ve just done here — there is a simpler
way, given by the expression:
But if there are three or more resistors in parallel you have
to use the long method, I’m afraid.
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