Resistance

• Resistance


  The potential difference required to drive a current through a component
• Resistance


  Determines how much energy is required to push a coulomb of charge through a component
• Low resistance component


  • Requires small potential difference to drive current
  • Transfers small amount of energy
• High resistance component


  • Requires large potential difference to drive current
  • Transfers large amount of energy
• Calculating resistance


  Resistance = Potential difference / Current
• Ohm


  Unit of resistance
• Resistance equation is not given in the exam, so it must be memorized
• Calculating potential difference


  Potential difference = Current x Resistance
• Plenty of questions on calculating resistance in the revision workbook