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 a small amount of energy to drive current through it
• High resistance component

  • Requires a large amount of energy to drive current through it
• Calculating resistance

  Resistance = Potential difference / Current
• Ohm


  Unit of resistance
• Rearranging the resistance equation

  Potential difference = Current x Resistance
• Calculating potential difference

  • Potential difference = 0.5 A x 50 Ω = 25 V