Distance relays respond to the voltage and current, i.e., the impedance, at the relay location. The impedance per mile is fairly constant so these relays respond to the distance between the relay location and the fault location.
By the time we reach college age, most of us are aware that real scientists are nothing like their movie counterparts. There’s a lot less wild hair, while bad German accents and screams of “it lives!” are few and far between. However, not so long ago, the line between real life and fiction was much more blurred. Right into the 20th century, great scientists were conducting vital, world-changing research while also, in some cases, presenting more than their fair share of oddness and peculiarity. Here, we give you ten real-life scientists who could give Victor Frankenstein a run for his money in the eccentricity stakes.
Online learning may not appeal to everyone; however, the sheer number of online learning sites suggests that there is at least a strong interest in convenient, portable learning options — many of which are study-at-your-own-pace. For your reference, we’ve selected 50 top learning sites and loosely collected them into the categories you’ll find below. While this is not a rankings list by any means, using a variety of criteria, we’ve filtered in some of the most popular sites in each category. Many of these sites offer free lessons; some require payment or offer verified certification for a nominal fee. Some sites offer very general non-academic lessons, others provided actual college / university curriculum course material. Whatever you are looking to learn, check out the list below before trying to wade through pages of search engine listings.