Electrical Calculations Arithmetic Conversions AreaVolume Formulas OhmsWatts SeriesParallel Geometry ACTrigonometry NECCalculations Advanced Calculations Journeyman Assign Masters Assignments Tables Check Values Garage Sale NEC Questions Calculations Workbooks Labs Order Workbooks

Series Parallel Combination Circuits


Voltage in Series

Current in Series

Resistance in Series

Wattage in Series

Voltage in Parallel

Current in Parallel

Resistance in Parallel

Wattage on Parallel

Combination 3 Components

Combination 4 Components

Combination 5 Components

Combination 6 Components

Unbalanced Load

Series Parallel Home

Electrician Math Home

Electrician Education Home

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.



Click on any of these titles from which may be of interest to you.
Order them directly from with a debit or credit card.


Many electrician workbooks and practice exams are now available 
as digital downloads for immediate use. 
Click HERE to see what is available.

Products For Sale
2006-2011 David U. Larson
Companion Website to , and
Other websites by David U. Larson which may be of interest: