The electrical theory concepts of series circuits, parallel circuits
are important for an electrician to understand. Calculations based on them will
be rare. But the calculations are a way to get an understanding of how these
theoretical concepts work in practice.
Combination circuits are a different story. I know there are usually a
couple combination circuit problems on a Journeyman level examinations, but for
the life of me, I do not know why.
Jump the hoops and learn the techniques of solution so that if you are ever
confronted with this sort of calculation, you'll have no problem. With practice
they are not difficult.
Here are the formulas for series circuits:
Voltage is additive.
Current is equal.
Resistance is additive.
Wattage is additive.
Here are the formulas for parallel circuits:
Voltage is equal.
Current is additive.
Resistance is the inverse of the sum of the reciprocals.
Wattage is additive.
You may want to write these formulas on a piece of paper that you can
refer to from time to time until you have memorized them, which is essential.
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