This could be used to show cams. The written exercises allow teachers to assess pupil knowledge. The text also explains systems and the use of feedback. If the pupils are shown the use of computers to control systems they can discuss the appropriate use of resources on a cost basis. Purpose is to show an uncontrolled system and the problems it creates.
Suggested example is a supermarket conveyor belt and three dozen eggs.
Demonstration of an infra - red beam controlling a motor and set the first task of controlling a conveyor belt using a beam switch. Work through the introduction part of the text explaining what systems are made of, the principle of modular design, the various modules and what they do and what feedback is. You may or may not want to look at amplification at this stage. There is a check your knowledge exercise included to test the pupils' knowledge of what they have done so far. You may wish to combine this exercise in control with practical electronics by getting the pupils to build some of the modules themselves.