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# EIT115-CH2

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

MATTER | Anything that has mass and occupies space |

ELEMENT | Any substance that cannot be broken down into two or more simpler substances. |

ATOM | The smallest particle o matter that retains the physical characteristics of an element |

BOHR MODEL | The simplest model of the atom. |

NUCLEUS | The central core of an atom. |

ELECTRONS | Particles that orbit the nucleus of an atom.): |

PROTONS | One of two particles found in the nucleus of an atom; the other is the neutron. |

ATOMIC NUMBER | A unique number for every element on the periodic table, equal to the number of protons in the nucleus of the atom. |

PERIODIC TABLE OF THE ELEMENTS | A table that identifies all the known elements. |

SHELLS | Electron orbital paths that circle the nucleus of an atom. |

VALENCE SHELL | The outermost orbital path for a given atom. |

CHARGE | An electrical force that causes two particles to be attracted to, or repelled from, each other. |

POSITIVE CHARGE | One of the two electrical charges; the other is negative charge. |

FREE ELECTRON | One that is not bound to an atom and is free to drift from one atom to another. |

CURRENT | The directed flow of charge through a conductor. |

VOLTAGE | A force that generates the flow if electrons (current) |

RESISTANCE | The opposition to current provided by a material, component, or circuit. |

COULOMB (C ) | The total charge on 6.25x1018 electrons. |

AMPERE (A ) | The unit of measure for the current; equal to one coulomb per second. |

CONVENTIONAL CURRENT | A theory that defines current as the flow of charge from positive to negative. |

ELECTRON FLOW | A theory that defines current as the flow of the electrons from negative to positive. |

DIRECT CURRENT (DC) | Current that is one direction only. |

ALTERNATING CURRENT (AC) | Current that continually changes direction. |

DIFFERENCE OF POTENTIAL | The difference between the voltages at any two points in a circuit. |

ELECTRICAL FORCE (E) | The difference in potential across the terminals of a battery or other voltage source. |

ELECTROMOTIVE FORCE (EMF) | Another name for electrical force; the difference of potential across the terminals of the battery or other voltage source. |

VOLT (V) | The unit of measure for voltage; the amount of electrical force that uses one joule of energy to move on coulomb charge. |

OHM | The unit of measure for resistance. |

CONDUCTORS | Any element or material that has extremely low resistance |

INSULATOR | Any element or material that has extremely high resistance. |

SEMI-CONDUCTOR | Any element or material with resistance that falls about midway between that of a conductor ant that o an insulator |

CONDUCTIVITY | The ease with which an element or compound conducts electricity. |

RESISTIVITY | The resistance of a specific volume of an element or compound. |

CIRCULAR-MIL-OHMS PER FOOT (CMIL-Ω/FT) | The resistivity of a specific volume of a conductor. The specified volume has a cross sectional area of one circular mil and a length of one foot. |

OHM-CENTIMETER Ω-CM) | The unit of measurement for the resistivity of one cubic centimeter of a material. |

MIL | A unit of length, equal to 0.001 inch. |

CIRCULAR-MIL (CMIL) | A measure of area found by squaring the diameter (in mils) of the conductor. |

CIRCULAR-MIL-FOOT (CMIL-FT) | A measure of volume with a diameter of one mil and a length of one foot. |

POSITIVE TEMPERATURE COEFFICIENT | A value that indicates how much the resistance of a material increases as temperature increases. |

NEGATIVE TEMPERATURE COEFFICIENT | A value that indicates how much the resistance if a material decreases as temperature increases. |

Created by:
vjambriz