Series Parallel Combination Circuits
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.
Here are the formulas for parallel circuits:
Voltage is equal.
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.
Many electrician workbooks and
practice exams are now available