# Shared Flashcard Set

## Details

Johnna ch 1 dc defintions
DC Circuits ch.1 important terms
29
Science
Professional
09/04/2013

Term
 alternating current
Definition
 *current that periodically reverses in direction*as the alternating voltage periodically reverses in polarity
Term
 ampere
Definition
 *basic unit of current* 1A= 1C/1s
Term
 atom
Definition
 smallest particle of an element that still has the same characteristics as the element
Term
 atomic number
Definition
 # of proton*balanced by an = number of electrons, in an atom
Term
 circuit
Definition
 path for current flow
Term
 conductance
Definition
 reciprocal of resistance
Term
 conductor
Definition
 *any material that allows the free movement of electric charges*such as electrons, to provide an electric current
Term
 conventional current
Definition
 *direction of current flow*associated with positive charges in motion*current flow direction is pos. to neg. potential
Term
 Coulumb
Definition
 *basic unit of electric charge * 1C=6.25x1018
Term
 current
Definition
 movement of electric charges around a closed path or circuit
Term
 dielectric
Definition
 another name for insulator
Term
 direct current (dc)
Definition
 current flow that has just one direction
Term
 electron
Definition
 most basic particle of negative charge
Term
 electron flow
Definition
 *movement of electrons that provides current in a circuit*current flow direction is from neg. to a pos. potential
Term
 electron valence
Definition
 # of electrons in an incomplete outermost shell of an atom
Term
 element
Definition
 substance that cnt be decomposed any further by chemical action
Term
 free electron
Definition
 electron that can move freely from one atom to the next
Term
 insulator
Definition
 material with atoms in which the electrons tend to stay in their own orbits
Term
 ion
Definition
 atom that has either gained or lost 1 or more valence electrons to become electrically charged
Term
 molecule
Definition
 smallest unit of a cmpd with the same chemical characteristics
Term
 neutron
Definition
 particle contained in the nucleus of an atom that is electrically neutral
Term
 nucleus
Definition
 massive, stable part of the atom that contains both protons and neutrons
Term
 ohm
Definition
 unit of resistance
Term
 proton
Definition
 most basic particle of positive charge
Term
 resistance
Definition
 the opposition to the flow of current in an electric circuit
Term
 semiconductor
Definition
 material that is neither a good conductor nor a good insulator
Term
 siemens
Definition
 unit of conductance
Term
 static electricity
Definition
 any charge, positive or negative, that is stationary or not in motion
Term
 volt
Definition
 unit of potential difference or voltage* 1V = 1J/1C
Supporting users have an ad free experience!