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Ohms Law Made Easy for Parallel Circuits

Understanding the Parallel Resistance Formulas, Parallel Circuit Rules and Parallel Circuit Math

Instructed by Steve Liguori

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  • Students will become Comfortable using the Parallel Resistance Formulas
  • Students will understand how Voltage, Current, Resistance and Power are Calculated in Parallel Circuits
  • Students will learn the Parallel Circuit Rules and Ohms Law Math Calculations for Parallel Electrical Circuits

Welcome to Ohm’s Law Made Easy for Parallel Circuits. By the end of this course, students will be comfortable with the Parallel Circuit Rules and the Voltage, Current, Resistance and Power Math Calculations for Parallel Circuits. Both Parallel Resistance Formulas are explained in detail and short cuts are provided to save you time once you understand the Formulas.

Ohm’s Law expresses the relationship between Voltage, Current and Resistance in an Electrical or Electronic Circuit. By knowing any two values, voltage and current, voltage and resistance, or current and resistance, the third value can be calculated mathematically. Understanding the Math behind these relationships can greatly improve you understanding and diagnostic thought process.

Series Circuits are used when lower than source or battery voltage is desired, or when you want components to share the source voltage.

Parallel Circuits are used when we want each device to receive the full source voltage. In Automotive circuits, most are parallel because, more often than not, it is desired that each component receives full battery or source voltage.

This course is Geared toward Automotive students, Beginning Electronics Students and Do it Yourselfers who desire a Solid Foundation and Understanding of Parallel Circuits and Ohm’s Law. This course does more than just show you a formula and tell you about a concept, it walks you through the thought process, the steps, and the reasoning behind them.

This course provides practice examples and detailed explanations of how the answers were calculated and determined.

Understanding Ohm's Law Math when coupled with Basic Electrical Fundamentals, can help students recognize incorrect voltage measurements and become better at troubleshooting, and Electrical diagnostics.

Let's get started!

  • It is easier to Understand this Course if you have taken the Ohms Law Made Easy for Series Circuits Course.
  • Beginner Electrical Students who want to Learn the Foundation Material to Help them improve their Diagnostic Skills
  • Intermediate Students who have never quite understood what Ohm's Law was all about.
  • Do it Yourselfers who want a solid foundation in Basic Electrical Circuits and the Math behind them.
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Section 1 : Parallel Circuit Rules

  • Lecture 1 :
  • The Four Parallel Circuit Rules are introduced and a brief explanation of each one is provided.
  • Lecture 2 :
  • Parallel Circuit Rule 1 Explained
  • Parallel Rule One explained in more detail.
  • Lecture 3 :
  • Parallel Circuit Rule 2 Explained
  • Parallel Circuit Rule Two explained in more detail.
  • Lecture 4 :
  • Parallel Circuit Rule 3 Explained
  • Parallel Circuit Rule Three explained in more detail.
  • Lecture 5 :
  • Parallel Circuit Rule 4 Explained
  • Parallel Circuit Rule Four explained in more detail.

Section 2 : Parallel Resistance Formulas and Calculations

  • Lecture 1 :
  • Two Formulas for Parallel Resistance
  • This lesson unveils the two formulas for calculating parallel resistance and gives a basic description of how to use them for calculating the total resistance of two resistors in parallel.
  • Lecture 2 :
  • Calculating Total Resistance for More than Two Branches
  • When there are more than two parallel paths, the calculation get a little trickier, especially if using formula one.  This lesson explains the process for tackling these examples when there are more than two resistors in parallel.
  • Lecture 3 :
  • Example 1 - Parallel Resistance Calculations
  • Parallel Resistance Calculation Practice One and Answers Explained
  • Lecture 4 :
  • Example Two - Parallel Resistance Calculations
  • Parallel Resistance Calculation Example Two with Answers Explained
  • Lecture 5 :
  • Formula Two - The Easy Way with a Calculator
  • Let's see how we can use a calculator's memory and function buttons to speed up the complex formula two calculations.
  • Lecture 6 :
  • Example Three - Three Resistors in Parallel
  • Parallel Resistance Calculation Practice Three and Answers Explained
  • Lecture 7 :
  • Example Four - Try One on Your Own
  • Test Your Skills and then Review the Answers
  • Lecture 8 :
  • Lets Get a Little Crazy
  • Here is a wild lesson on calculating the total Resistance of many resistors in parallel.  And let's provide a short cutting method that will save you some time.
  • Lecture 9 :
  • Using Parallel Resistance Shortcuts
  • The Shortcuts are Great, but don't force them on an example when they shouldn't be used.  They can be a big timesaver; however, sometimes you just have to do the Math.
  • Lecture 10 :
  • Additional Practice Examples
  • Try a Few More Parallel Resistance Examples to really get the hang of it!  The examples can be downloaded from the additional resources.
  • Lecture 11 :
  • Answers to the Additional Practice Examples
  • Let's Review the Additional Practice Examples and then move on to Ohm's Law Calculations

Section 3 : Ohm's Law Review

  • Lecture 1 :
  • Ohm's Law Review
  • Ohm's Law Review. This lesson explains the purpose of the review section and describes the review lessons that follow.
  • Lecture 2 :
  • Ohm's Law Formulas
  • This lessons reviews the Ohm's Law Formulas that are described in detail in the Series Circuit Course.  This review will help get you ready for the Ohm's Law Calculations in the next section on Parallel Math examples.
  • Lecture 3 :
  • Power Formula
  • This lessons reviews the Power Formulas that are described in detail in the Series Circuit Course.  This review will help get you ready for the Ohm's Law Calculations in the next section on Parallel Math examples.

Section 4 : Parallel Math Examples

  • Lecture 1 :
  • Parallel Example 1
  • Parallel Math Example One - The thought process and method is explained in detail for finding the missing Voltage, Current,, Resistance and Power.
  • Lecture 2 :
  • Parallel Example 2
  • Parallel Math Example 2 - Three Resistors in Parallel.  Download and print out the example from the additional resources, and try to work through it on your own and see how you do.
  • Lecture 3 :
  • Parallel Example 3 - Test Your Skills
  • Parallel Math Example 3 - Test Your Skills.  Download the example from the additional resources and give it a try!
  • Lecture 4 :
  • Parallel Example 3 - Answers
  • Review for the "Test Your Skills" Parallel Math Example Three from Lesson 22.
  • Lecture 5 :
  • Demo - Three Bulbs in Parallel
  • This lesson provides a demonstration of three bulbs in parallel and shows that each bulb will be at it's full brightness.
  • Lecture 6 :
  • Bonus Lecture
  • In this Bonus Lecture, we will demonstrate bulbs in four parallel paths with two of the paths having multiple bulbs in series inside the paths. This will give you a preview and wet your appetite for a new course coming soon on Series/Parallel combination circuits and their calculations. If you have not already, I also recommend you check out my other Electrical courses on Basic Electrical Fundamentals and Schematic Diagnostics. Thank you so much for taking this course! Send any Questions or Comments to [email protected]
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Steve Liguori,

I am a fully Certified Master Automotive Technician by ASE (Automotive Service Excellence)  and Scored 100% on the Electrical/Electronic Systems Certification Test.  I have been a coach and teacher for most of my life, training students both young and old.  In my 26 years of experience as an Expert Diagnostic and Repair Technician for Automotive Dealerships, I was the go to guy for vehicles with problems that no one else could fix, as well as a Shop Foreman and Instructor of fellow technicians.  More recently, I have educated students for almost 10 years as an Instructor of Automotive, Electrical, and Electronics systems at a Technical School in NY.  While there I received a Recognition Award as Top Instructor for being able to get through to students that others thought could not succeed. To me Teaching should be about: Getting the Students Involved in the Learning Experience. Lecturing with a Purpose, not just to show how much you know. Teaching in a way that let's students realize "they can do this", not how hard it is. I am Passionate about what I do - I am here to Teach and take Great Pride in every light bulb I can Turn on.
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