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# 2013 unit 2 as elect

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

charge carriers | are + ions or electrons in an electrolyte, electrons in a conductor |

Coulomb | the charge supplied by a current of 1 amp in 1 second |

Current | the charge supplied by a current of 1 amp in 1 second |

Drift velocity | the average velocity of an electron when it travels through a wire due to an applied pd |

Electromotive force | the electrical energy transferred per unit charge from other forms of energy |

Kilowatt hour | a unit of energy equal to 1 kw for 1 hour (or 3.6 Mj) |

Kirchoffs first law (due to conservation of charge) | the total current flowing into a junction is the same as the total out. |

Kirchoffs second law (due to conservation of energy) | sum of the e.m.f.s around a closed loop = sum of the p.d.s |

Ohm | a volt per amp ( VA-1) |

Ohm's Law | current through a conductor is proportional to the potential difference across it provided temperature remains constant |

Potential difference | energy transfer per unit charge from electrical to other forms |

Power | energy transfer /work done per unit time |

Resistance | p.d./current |

Resistivity | resistivity=resistance x cross section area/length |

Terminal p.d. | the potential difference available from the output terminals of a source of electricalenergy when current flows |

Volt | joule per coulomb (JC-1) |