Difference between electrical, electronics, computer systems?

What is the difference between an electrical system, electronics system and computer based system? Each of these represent a paradigm shift. So what was the change in principle and thinking represented by each of these revolutions? For example, in application, how would an electronic control system differ from an... show more What is the difference between an electrical system, electronics system and computer based system? Each of these represent a paradigm shift. So what was the change in principle and thinking represented by each of these revolutions? For example, in application, how would an electronic control system differ from an electronic system differ from a computer system.
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