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A sinusoid measures 2.3 V peak to peak on the screen. Its root mean square value is about

  • A.1.63 V
  • B.2.3 V
  • C.1.15 V
  • D.0.81 V

Answer: D

The peak is 1.15 V and the root mean square value is \( 1.15/1.414 = 0.81 \) V. An oscilloscope always shows the instantaneous waveform, so every root mean square figure taken from it involves a factor that depends on the shape of the wave.

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