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# Topic 6 vocab

### Physics Vocabulary

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

Ammeter | A low resistance device wired in series in an electric circuit, used to measure the current. - Consist of a shunt connected in parallel with a galvanometer -Symbol= -------A------ |

Ampere (A) | The SI unit of electric current, defined as one coulomb of charge passing a point in one second: 1 A= 1 C/s |

Circuit | The complete path of electric current including the source of the current and the resistors. |

Conductivity | The reciprocal of the resistivity of a substance' a measure of how well a substance sustains a electric current. |

Conventional Current Model | The current flows out of the positive terminal, through the circuit and into the negative terminal of the source. -" right hand rules" |

Current | The amount of electric charge flowing past a specific point in a circuit for a unit of time. |

Direct Current (DC) | An electric current that flows in only one direction. |

Electric Circuit | A closed path in which an electric current can flow. The path must include a source of potential difference, and may include one or more resistors. |

Electric Current | The flow of electric charge, measured as the rate at which electric charge flows past a given point. - The SI unit of current is the ampere, A; 1 ampere= 1 Coulomb per second (1 A= 1 C/s) |

Electric Power | The time- rate at which electric energy in expended. - The watt (W) is the SI derived unit for electric power. -For conductors that obey Ohm's Law - Scalar quantity (W=PT=Vlt=I^2RT=V^2T/R) |

Equivalent Resistance | A single resistance that is equivalent to as set of resistances in a series or parallel circuit. |

Kirchoff's Law | Conservation of Charge : The sum entering any current junction is equal to the sum leaving that junction. |

Magnet | Contains material, usually iron, whose nuclei are oriented in a common direction. - Have Polarity -Opposites attract, Likes repel |

Magnetic Field | Exist in areas around natural magnets and in regions around electric currents. |

Magnetic Flux Lines | A magnetic field is mapped by imaginary magnetic lines of force called flux lines. -The lines of force always for closed paths(never cross) |

Ohm | The SI derived unit of resistance. - One Ohm= 1 volt per ampere (1 Ohm =1 V/A) |

Ohm's Law | At a constant temperature, the current in a metallic conductor is directly proportional to the potential difference between its ends and inversely proportional to its resistance: V=IR - Does not hold for semiconductors |

Parallel Circuit | A circuit in which there is more than one current path. |

Resistance | Opposition to current flow offered by a conductor or semiconductor; the ratio between potential difference across and current in a conductor: R=V/I |

Resistor | A device that offers resistance in an electrical circuit. |

Series Circuit | A circuit in which there is only one current path. |

Voltage | Another name for electrical potential difference, arising from the volt, the unit of measure for potential difference. |

Voltmeter | A high resistance device used to measure the potential difference across two points in an electric circuit. |

Watt (W) | The SI unit of power; a derived unit equivalent to one joule per second: 1W=1J/s |

Resistivity | A quantitative indication of the electrical resistance of a material at specific temperature. |

Volt (V) | The SI unit of electric potential or potential difference. |

Cross Section | A view of a solid made by cutting it perpendicular to its longest axis |

Grounding | The addition or removal of electrons to or from an object in order to naturalize its charge. |