Why Three-Phase Circuits ?

After studying this unit, you should be able to:
 Discuss the differences between three-phase and single-phase voltages.
 Discuss the characteristics of delta and wye connections.
 Compute voltage and current values for delta and wye circuits.
 Connect delta and wye circuits and make measurements with measuring instruments.
Most of the electrical power generated in the world today is three-phase. Three-phase power was first conceived by Nikola Tesla. In the early days of electric power generation, Tesla not only led the battle concerning whether the nation should be powered with low-voltage direct current or high-voltage alternating current, but he also proved that three-phase power was the most efficient way that electricity could be produced, transmitted, and consumed
Why Three-Phase Circuits ?