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# AC Fundementals

### Study aid for Apprentice Electricians

Question | Answer |
---|---|

The % of change in one time constant. | 63.2% |

Self induced voltage will always oppose the applied voltage by_____degrees. | 180 |

Inductance is measured in? | Henries (H) |

Capacitance is measured in? | Farads (F) |

One cycle has how many alterations? | Two (2) |

Higher frequency on a given value capacitor will cause current to? | Increase |

The amount of charge on the plates of a capacitor is a function of? | Current and Time |

The formula for finding a RMS value is? | Emax or Imax times sine(45) |

In a capacitor, the electric energy is stored in a(n)___________ Field. | Electrostatic |

What is an example of a variable capacitor? | A radio tuner |

In an inductor, electric energy is stored in a(n)____________ field? | Electromagnetic |

Mica, paper and electrolytic are three types of: | Capacitors |

The effective value of AC is based on the heating effect of the equivalent DC. | True |

When current and voltage peak in the same direction at the same time it is called: | In Phase |

The inductance symbol is | L |

The total opposition to current in an AC circuit is; | Impedance |

Inductance opposes a change in: | Current |

Volts per millimeter is used to measure: | Dielectric Strength |