Wednesday, October 31, 2012

eletricity and magnetism book ch 1 vocab

  • ion
positively or negatively charged atom
  • static charge
buildup of electric charge on an object
  • electric force
 attractive or repulsive force exerted by all charged objects on each other
  • electric field
 field through which electric charges exert  a force on each other
  • insulator
 material such as wood or glass through which electrons cannot move easily
  • conductor
 material such as copper or silver through which electrons  can move easily
  • electric discharge
 rapid movement of excess charge from one place to another
  • electric current
 flow of charge either flowing electrons or flowing ions through a conductor
  • circuit
 closed conducting loop through which electric current can flow
  •  voltage
 a measure of how much electrical each electron of a battery has measured in volts
  • resistance
 a measure of how difficult it is for electrons to flow through a material; unit is the ohm
  • ohm's law
 relationship among voltage current and resistance in a circuit
  • series circuit
 circuit that only has one path for a electric current to follow
  • parallel circuit
 circuit that has more than one path for a electric current to follow
  • electric power 
rate at which an electric appliance converts electrical energy into another form of energy usage is measured in electric meters in kilowatt hours

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