What a lot of people don't realize is that the foundation for understanding the NEC rules for electrical installations is electrical theory! Whether you're a first-year apprentice still struggling to understand the difference between a volt or ampere, or a veteran electrician trying to sharpen your troubleshooting skills, this product has something for you.

We're sharing this clip from the program to introduce you to the importance of this topic. Please feel free to share this with your friends and co-workers, and for more videos and content on this topic, check out our Electrical Theory Video Library that includes the full program and digital textbook.

The content below is extracted from Mike Holt's Understanding Electrical Theory for NEC Applications textbook.

Click here or on the thumbnail to the left to view or download the PDF of this section. (2 pages, 70 KB) Click on the image above to watch the video The Power Formula Circle demonstrates the relationship between power, current, and voltage. To apply the Power Formula Circle, place your finger on the unknown value for which you are looking, and the two remaining variables “show” you the formula to be used. Using the Power Formula Circle isn’t difficult, as you’ll find out by reading the text and watching this video. Mike and the team discuss calculating and applying electrical power formulas. Click on the image to the right to watch the video and be sure to download the PDF to follow along.

For more information on this topic, get a copy of Mike Holt's Understanding Electrical Theory video program and textbook.

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