2.16 understand that current is the rate of flow and charge

  • Current is the rate of flow of charge
  • Current is not ‘used up’, what flows into an electrical current flows out
  • Current is measured in Amps (amperes)
  • Current is measured with an ammeter, connected in series 

 

  • Potential difference (volts) across electrical components is required to make electrons flow – this is what cells and batteries provide.
  • Potential difference is measured in volts
  • Potential difference is measured by a voltmeter, connected parallel to the component

 

It is possible to have voltage but no current, but current 
cannot flow without potential difference (Voltage)
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