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Explain "sequential"
When a signal is looped back into a system, the resulting effect is called '''feedback'''.
When a signal is looped back into the system that produced it, the resulting effect is called '''feedback'''.
Feedback can be positive or negative, but these terms do not imply whether the feedback is wanted or not.
Feedback can be positive or negative, but these terms do not imply whether the feedback is wanted or not.
Feedback causes the output to depend not only on the current values of the inputs but on what they were in the past, because one input is actually the prior output. This is why an electrical [[circuit]] with feedback is called a sequential electric circuit. One main element of sequential electric circuits is the [[flip flop]].
==Positive feedback==
==Positive feedback==