Analog robot
An analog robot is a type of robot which uses analog circuitry to go toward a simple goal such as finding more light or responding to sound. The first real analog robot was invented in the 1940s by William Grey Walter. The name of these robots were ELSIE and ELMER (Electro Mechanical Robot). The original circuitry was developed using two vacuum tubes and a photocell to search and follow a light. Recently a kind of analog robots was developed by Mark Tilden.
Robotics
According to the "Oxford English Dictionary", the word "robotics" was first used in print by Isaac Asimov, in his science fiction short story ""Liar!"", published in May 1941 in "Astounding Science Fiction". Asimov was unaware that he was coining the term; since the science and technology of electrical devices is "electronics", he assumed "robotics" already referred to the science and technology of robots. In some of Asimov's other works, he states that the first use of the word "robotics" was in his short story "Runaround" (Astounding Science Fiction, March 1942), where he introduced his concept of The Three Laws of Robotics. However, the original publication of "Liar!" predates that of "Runaround" by ten months, so the former is generally cited as the word's origin.