DIRECT and ALTERNATING CURRENT

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Direct Current

DIRECT CURRENT- Electric current in a circuit that is in one direction only.

  • most likely objects that have a direct current run off a battery eg a torch

Alternating current

ALTERNATING CURRENT- Electric current in a circuit that repeatedly reverses its direction (ie up, down). it flows like this in successive cycles.

  • objects that have a AC is mains supply in a house. 
  • FREQUENCY= number of cycles it passes through each second.

Measuring an alternating Potential Difference

  • an oscilliscope- used to display the shape of an electrical wave- can be used to measure:
  • PEAK POTENTIAL DIFFERENCE and FREQUENCY of a low voltage AC SUPPLY
  • PEAK PD
  • (is the same as peak voltage)=
  • THE MAXIMUM VOLTAGE MEASURED, FROM 0 VOLTS.
  • you measure at

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