Wikipedia is not the ultimate resource--in fact some entries invite disambiguation if WIKI feels the contribution is flaky. Readers are bombarded with lots of useless information.
As one educator says:
A professor who recommends Wikipedia is like a dietician who recommends a steady diet of Big Macs.
Is this directed at my link to the Wikipedia article about 2 phase power? I know that Wikipedia is not the ultimate resource, and I don't eat Big Macs all the time. On the other hand, some articles can be confirmed to be correct and are the best to refer to because they bring the information together in a clearer presentation than the other resources, which I feel is the case for the definition and explanation of two-phase power. But for those who don't trust the Wikipedia info, here are some other resources that agree that two-phase power is produced by a single generator with the phases 90 degrees apart.
http://electriciantraining.tpub.com/14177/css/Two-Phase-Alternators-70.htmhttp://www.testandmeasurementtips.com/basics-of-polyphase-power/http://www.ablegroup.net/3phase-2phase.htmhttp://www.thefreedictionary.com/two-phase