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# The Math

1. ## The Math

I know this is a simple question but can someone help explain this?

Determine the RMS amplitude of this sinusoidal waveform, as displayed by an oscilloscope with a vertical sensitivity of 0.2 volts per division:

2. Originally Posted by Ronwilson1801
I know this is a simple question but can someone help explain this?

Determine the RMS amplitude of this sinusoidal waveform, as displayed by an oscilloscope with a vertical sensitivity of 0.2 volts per division:

The thicker lines in the middle that split the graph into quadrants are the 0 lines, representing voltage (horizontal) and time (vertical). The wave peaks just above the second horizontal line up from the middle, if the lines are 0.2 volts each, then the peak is a little over 0.4 volts. If you look very closely there are 5 diving lines per division (0.2 / 5 = 0.04), so closer to 0.44 volts peak.

To find RMS, take the peak value and multiply by 0.707. In this case 0.44 x 0.707 = 0.31108.

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