![]() ![]() The transfore is designed for f1, so it works the best at that frequency. For simplicity, we put in three signals, f1, f3, and f5, which are the fundamental and two harmonics. Mainly because you can think of the transformer of looking at it the same way. Rather than do the complex analysis (which would probably require a simulation), we can find what y1 is from x1, y2 from x2, 圓 from x3 and then just add those up to find the composite signal y. We have some composite output y, that is made up of y1,y2,圓, etc. We are putting a signal in that is composed of many other signals, x1, x2, x3, etc. For instance, lets treat the transformer as a black box. In fact, this is precisely the concept of superposition. The transformer doesn't really "know" that it is made up of lots of sinusoids. ![]() Whether AC sine/square or pulsating DC, a magentic field builds and collapses as a result of the changes in voltage presenting a different load than just a simple resistor - which is why it doesn't burn up like it would if pure DC were applied for a time. I'd call this pulsating DC - if there's a better term I'd appreciate knowing what it is. An example might be the output of a logic or clock circuit that is actually square in shape but is only rising from zero up to some value, dwelling, drops to zero, dwells at zero then rises again. The voltage generated by an alternator rises/falls as a sine wave because of the rotation of the alternator - or as a result of the oscillator or source.Ī square wave can do the same thing - rise above zero, dwell, drop past zero to some negative value, dwell, then rise to zero.īe careful not to mix this up with a "square wave" that isn't really alternating. The voltage rises from zero to some maximum, drops to zero then goes "minus" to some level below zero then back up to zero. I'd rather not add to the confusion but thought it good to point out that what I understand as AC (alternating current) alternates or changes polarity once per cycle.
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