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    Arc Waveform & AC Power

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    Please help with the following problem. This
    A) The difference of an ac waveform being displayed on an oscilloscope
    is of 6.5 volts between 90° point and the 270° one .
    What is the RMS value of the displayed signal ?

    b) What is the value of the ac power that can perform the same
    amount of work as a 24 dc 0ne ?

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    Solution Preview

    Please view the attached figure.

    An ac waveform is said to complete one cycle when the angle changes from 0 degree to 360 degree.

    We denote the peak voltages by Vp. There are two peaks in the figure, one at 90 degree and the other at 270 degree (though it is negative).

    It is given that the difference between these voltage points is 6.5Volts

    We call it V_pp

    pp = peak to peak

    So we have the peak to peak value of an ac wave form. As you can see, the voltage changes from 0 to maximum and the cycle repeats. That is why we have peak to peak and RMS (root mean square) value of the voltage when we deal with ac waveforms.

    Peak ...

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