Alternating Current

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  • Technically, a fancy voltmeter.
  • The trace seen is an electron beam.
  • The time base controls how fast the beam moves along the screen. It is set at the front of the oscilloscope.
  • The height of the trace at any point shows the input voltage.


  • Measuring the distance between successive peaks along the time axis gives you the time period.
  • You can use this to calculate the frequency.
  • f = 1/t
  • The peak voltage is useful to know!

Vrms and Irms


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