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Understanding 3 Phase Electricity

This computer program explains 3 Phase electricity in 13 interactive screens of text, graphics, and animation.  Three phase electricity is used in virtually every electrical power distribution system.

The program is recommended for electricians, technicians, engineers, and anyone else who want to understand 3 phase electricity.

Some knowledge of electrical voltage and current is assumed, and a familiarity of 1 phase electricity is helpful but not required.

This program was written by a Professional Engineer who has taught electrical engineering technology for 18 years. The program is written in .html format so you can use your favorite internet browser with hyperlinks, bookmarks, and word searches, and requires no software installation on your computer.  Just double-click on the Table of Contents.html and your internet browser launches the program.

What you will learn...

Table of Contents


1. Introduction     

2. 3 Phase (vs) Single Phase Electricity

3. How 3 Phase Electricity is Made        
4. Wye and Delta Loads

5. Phase and Line Currents and Voltages
6. Three Phase Power              
7. Vectors and Phasors
8. Scribing out a Sinewave
9. Where the Square Root of 3 Comes From
10. The Neutral Wire

11. Phase Sequence

12. Advantages of 3 Phase Electricity

13. Common 3 Phase Connections


Example screen explaining phase and line voltages and currents


Example screen explaining the neutral wire



Example screen showing phasors scribing out 3 phase electricity


Hardware/Software Requirements:

A computer with an internet browser such as Internet Explorer, Netscape, Firefox, Chrome, etc.