Q. What is the shortest word in the English language that contains the letters a, b, c, d, e, and f?
I clearly remember the first time that I was introduced to the concept of feedback; it was in an Electronics lesson, rather strangely. The class lecturer stood at the blackboard with a piece of chalk (as they did in the last century) and drew the following diagram:
He then made a rather bold claim about the meaning of feedback:
"Taking a portion of the output and comparing it with the input to decide whether you are getting what you want out of a system."
And in a beautifully simple way, he gave me a definition ...