As an example, the nameplate diagrams of large polyphase transformers with involved phase relations between the winding elements are usually presented ... Since the voltage and/or the current may be positive, zero, or negative numerically, the product p may likewise be positive, zero, or negative numerically . ... Suppose a student is at the library and walks down to the Electrical Engineering building.

Title | : | Introduction to electric energy devices |

Author | : | F. Robert Bergseth, Subrahmanyam S. Venkata |

Publisher | : | Prentice Hall - 1987 |

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