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# AP Physics 1

### Vocabulary Chapter 18

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

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 |

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

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

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

Ohm | (Ω) The SI derived unit of resistance. > One ohm=1 volt per ampere(1Ω=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 >ohm's law does not hold for semiconductors. |

Resistance | Opposition to current flow offered by a conductor semiconductor; the ratio between potential difference across and current in a conductor: R=V/I >1Ω=1 V/A |

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

Resistor | A device that offers resistance in an electrical circuit. The symbol for a resistor is; ~~~ |

Electric Power | The time-rate at which electric energy is expanded. >Electric power is a scalar quantity. |

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

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