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EIT115-CH2

QuestionAnswer
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