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# Electrical Vocab.

### 3rd Period Engineering/Robotics J.T.

Term | Definition |
---|---|

Amp (ampere) | unit of electrical current equal to a flow of one coulomb per second |

Voltage | an electromotive force or potential difference expressed in volts |

Ohm | the SI unit of electrical resistance, expressing the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt |

Resistor | device having a designed resistance to the passage of an electric current |

Parallel circuit | closed circuit in which the current divides into two or more paths before recombining to complete the circuit |

Series circuit | closed circuit in which the current follows one path |

Capacitor | device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator |

Ohm's law | law stating that electric current is proportional to voltage and inversely proportional to resistance |

AC current (alternating) | electric current which periodically reverses direction |

DC current (direct) | electric current flowing in one direction only |

Watt | the SI unit of power, equivalent to one joule per second, corresponding to the power in an electric circuit in which the potential difference is one volt and the current one ampere |

Circuit | path in which electrons from a voltage or current source flow |

Electrical ground | an electrical conductor placed in the ground or earth to protect consumers from unfortunate electrical shocks and to provide return path for electrical current |

Conductor | material or device that conducts or transmits heat, electricity, or sound well |

Insulator | substance or device which does not readily conduct electricity |

Joules (electrical) | SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of the action of the force, equal to one 3600th of a watt-hour |

Coulomb | the SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere |

Resistance | an electrical quantity that measures how the device or material reduces the electric current flow through it |

Transistor | a semiconductor device with three connections, capable of amplification in addition to rectification |

Hertz | the number of cycles per second; the SI unit of frequency, equal to one cycle per second |