Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Why are the graphs all +1 to -1 when the transformers are 28Vrms, 58Vpk, and 22Vrms? You don't have room to draw the answers to the problems. Why does the third problem show the transformer as 22Vrms in the schematic and the text says 13Vrms? Are the voltages for the whole windings end to end or are they per winding (example 1 is it 28-0-28 or 14-0-14)?
The +1 and -1 in the graph do not represent a voltage they are there as a indicator of constant, this shows that the transformer is centre tapped. The main calculations are to do with the RMS to Peak and Peak to Peak voltages.
Volts peak = volts RMS times 1.414
Volts RMS = volts peak times 0.7071
For sine waves
To calculate the RMS value of a sine wave, multiply the peak value by 0.707. The peak value is, of course, one half the peak-to-peak value. To go the other way, reverse the order of operations. That is, if you're starting with an RMS value, divide by 0.707 and then multiply by two to get the p-p value. Another way to convert from RMS to p-p is to multiply the RMS value by two square roots of two: RMS x 2 x SQR(2).
Or more simply, to convert from RMS to peak to peak voltage:
(RMS x 1.414) x 2=P-P
For example:
120vac x 1.414= 170vac
169.68vac x 2 = 339.36vac P-P
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.