I also have tried that. Our text uses .7 for Silicon but anyway, it still doesn't equal. 5.48vYou have to account for about 0.6v drop across the rectifier diode.
* That's not average,it's RMS.Out of the transformer comes a 10v peak waveform fully rectified half cycles, at any time during conduction the diode drop is approx 0.7v*2 = 1.4v so it's almost a 8.6v peak waveform (apart from some reduction in the total ON period) so the average is less than 8.6 * 0.707 = 6.08v.*
I don't know offhand how much the conduction angle affects the voltage but it is definitely less than 6.08v, so the best answer would be the next value down which is 5.48v. (Because 2.74 is definitely too low, and 6.37 is definitely too high).
Yeah,you have allowed for the fact that the "half cycles" now have time gaps between them,so the average falls.See the attached image.
The voltage across the load resistor doesn't look like the blue curve; it looks like the red curve (both waveforms have peak values of 8.6 volts).
The average of the blue voltage waveform is 5.47493 and the average of the red waveform is 5.02869
I think none of the book answers are correct.
But the voltage out of a full wave rectifier into a resistive load is not an average it's an RMS. I assumed "average" was the OP's wording choice.* That's not average,it's RMS.
Average is 8.6* 0.637=5.478≈5.48v
What does it mean to say that a voltage "is" or "is not" average or RMS? How can a voltage have the property of being RMS? Isn't it just a matter of how one chooses to measure it? Can't I measure a voltage with a meter that indicates the average (DC) value, or the RMS value, as I choose, or as some requirement compels me to do?But the voltage out of a full wave rectifier into a resistive load is not an average it's an RMS.
The very first sentence in post #1 says "The question asks, what is the average value of the output voltage fro the circuit." That suggests to me that the problem is asking for average value rather than it being the OP's choice of wording.I assumed "average" was the OP's wording choice.
Expect the unexpected in the Homework Section ... but keep participating.Well generally in full wave PSU design we care about the power output, so RMS calcs are the norm. I don't ever remember seeing a full wave PSU question in a test asking about "averages", but then it's been 30 years since I sat in the classroom so I should probably shut up now!