Ib review 5 - circuits

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Ib review 5 - circuits

  1. 1. Electric currentsPotential difference – definition – energy difference per chargeElectron volt – energy needed to move one electron across onevolt of potential differenceCurrent – rate at which charge flowsResistance – ratio of potential diff to currentResistance in a wire
  2. 2. Ohm’s LawOhmic vs non-ohmic (filaments)Power dissipationElectromotive force – terminal voltage when no current flowsInternal resistanceResistors in series and parallel
  3. 3. Circuit diagramsKirchoffAmmeter and voltmeters – resistance and placementPotential dividerSensorsLDRsThermistors

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