## Alternating Currents |

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### Contents

ART PAGE 1 ALTERNATING QUANTITIES | 1 |

VALUE OF AN ALTERNATING QUANTITY | 2 |

RELATION BETWEEN DIFFERENT VALUES | 3 |

THE CURVE OF SINES | 4 |

VIRTUAL AND MEAN | 5 |

COMBINATION OF HARMONIC QUANTITIES | 6 |

ALTERNATING E M F | 9 |

THE THREE PROPERTIES OF A CIRCUIT | 14 |

CIRCLE DIAGRAMS | 28 |

APPROXIMATE AIRCORED REACTANCES | 30 |

ALTERNATIVE TREATMENT | 36 |

EDDY CURRENT LOSSES | 37 |

AIR GAP | 39 |

MAXIMUM PHASE ANGLE | 42 |

TRANSFORMER IDEAL FORM | 43 |

THE CORE IMPERFECTIONS | 44 |

INDUCTANCE | 17 |

CONDENSER | 20 |

SERIES CIRCUITS | 22 |

WATTMETER ERROR | 25 |

PARALLEL CIRCUITS | 26 |

RESISTANCE IMPERFECTIONS | 45 |

EQUIVALENT CIRCUIT | 50 |

ART PAGE | 53 |

CONSTANTS | 70 |

### Common terms and phrases

absolute units air gap alternating current alternating quantity ammeter amperes apparatus approximately attain autotransformer calculated called condenser condition constant copper loss core coil core loss core-flux corresponding current taken current vector curve cycle definite denoted depends desired direct current drop eddy current energy equation exactly proportional factor flux-turns follows frequency full load given gives harmonic quantities heat hence hysteresis hysteretic ideal transformer induced e.m.f. inphase instant instrument iron core joules magnetic circuit magnetising current magnetomotive force maximum induction maximum value mean value measure namely ohmic output parallel periods phase angle pressure and current pressure demanded pressure vector primary circuit primary current ratio reactance coil readily relation represent seen self-inductance series circuit shown in Fig simple harmonic square steady temperature storage stray flux terminal pressure vector diagram vector representation virtual value voltmeter circuit volts wattmeter watts winding wire Xm and Ym zero