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# ch. 34 vocab

### physics ch. 34 vocab

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

potential difference | the difference in electric potential between two points free charge flows when there is a difference and will continue until both points reach a common potential |

electric current | the flow of electric charge measured in amperes |

ampere | SI unit of electric current. a flow of one coulumb of charge per second is one ampere. symbol A |

voltage source | a device such as a battery or generator , that provides a potential difference |

electric resistance | the resistance of a material to the flow of electric current through it is measured in ohms |

superconductivity- | a property of a material that has infinite conductivity at very low temperatures , so that charge flows through it without resistance |

ohm | the SI unit of electric resistance . one ohm is the resistance of a device that draws a current of one ampere when a volt is impressed across it |

ohm's law | the statement that the current in a circuit is direclty portional to the voltage impressed across the circuit , is inversely proptional to the resistance of the circuit |

direct curent (DC) | electric current whose flow of charge is always in one direction |

alternating current (AC) | electric current that repeatedly reverses direction twice each cycle . usually at 60 cycles per second of hertz |

electric power | the rate at which electrical enegery is converted into another form such as light, heat, or mechanical energy |