MACS Monthly Newsletter - 2022 - AUG7

Setting The Stage for Testing
Figure 9: Remember the seesaw relationship between resistance and current flow.
Did you know that there are five different ways for
a short circuit to happen?
There are a number of ways that an electrical circuit
can fail. But I would put to you that they all share
one thing in common. The resistance of the circuit
has been altered and the resulting change in current
flow is causing the problem. Remember Ohm's law?
Here's what I want you to take away from it (Figure
9).
" For any increase in resistance (at a stable voltage),
current flow will decrease. "
and...
" For any decrease in resistance (at a stable voltage),
current flow will increase. "
The most common cause of electrical concerns is
going to be related to increases in resistance. How
August 2022
7
does a circuit resistance increase? We introduce a
source of resistance that wasn't originally designed
to be there. I refer to these as " thieves " who come to
steal away voltage potential from the LOAD, which
deprives the LOAD of what it needs to function
properly. To fully understand why, you need to understand
Kirschoff 's Law, which simply put says that
all the voltage available will be consumed by ALL of
the resistances in the circuit, in proportion to the
resistances to each other.
Wow, that 's a mouthful!
In the real world, what that means is that if an unwanted
source of resistance is added to the mix, the
voltage potential will be split between the thief and
the LOAD proportionally. Remember, while all other
elements in the circuit have resistance, in comparison
to the LOAD, they are minute. The LOAD determines
the total circuit resistance and resulting current
flow. See Figure 10.
MACS Service Reports
Pete Meier

MACS Monthly Newsletter - 2022

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