resistance

• Resistance


  The potential difference required to drive a current through a component
• Energy transfer in an electric circuit

  1. Cell contains chemical energy

  2. Chemical energy transferred to electrical energy

  3. Electrical energy carried by current

  4. Electrical energy transferred to other forms of energy (e.g. light, thermal) in components
• Potential difference across a component


  Indicates the amount of electrical energy transferred in that component
• Resistance


  Determines the potential difference required to drive a current through a component
• Low resistance component


  Requires low potential difference to drive current
• High resistance component


  Requires high potential difference to drive current
• Ohm (Ω)


  Unit of resistance