The average value of 100 volts peak AC is
- 70.7 volts.
- 141. 4 volts.
- 63.7 volts.
Explanation
The average value over a half-cycle of a sine wave is 0.637 of the peak, so 0.637 * 100 = 63.7 V. The 70.7 V figure is the RMS value (0.707*peak) and 141.4 V is sqrt 2*peak, so neither represents the average.
obrien99 asking:
I think this might be incorrect.
i assume the question is looking for the rms value?
the formula for rms is -
peak voltage x 0.707
or
peak voltage / 1.414
both formulas give 70.7 as the answer
am i missing something?
Community Comments (2)
D
dimky Posts: 514 09.07.2014 / 20:39
Hey Obrien.
Not RMS value but average value, that are different things.
Average value of AC sine wave equals 0.637 * peak voltage, so answer is 63.7
Here is good article for those who will need information about all that stuff: http://www.learnabout-electronics.org/ac_theory/ac_waves02.php
Not RMS value but average value, that are different things.
Average value of AC sine wave equals 0.637 * peak voltage, so answer is 63.7
Here is good article for those who will need information about all that stuff: http://www.learnabout-electronics.org/ac_theory/ac_waves02.php
O
obrien99 Posts: 17 09.07.2014 / 20:55
nice one thanks
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