аЯрЁБс>ўџ ўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџьЅС5@ јПhbjbjЯ2Я2 1­X­X07џџџџџџˆЪЪЪЪЪЪЪddd8œА Жац(˜šššššš$Я R! vОЪОЪЪгRЪЪ˜˜B\ЪЪ\Ф љBЈ™{Уd`L\„щ0 \— ЌR— \ођЪЪЪЪ— Ъ\(ООddўdELECTRONICS - Systems Electricity is a very useful form of energy since it can be used to so many different things. But it needs to be controlled. You can use switches but if you want the control to be automatic then you need to use electronics. With electronics you can make a light come on when it gets dark, or heating to come on when it gets cold - and switch off again when the right temperature has been reached. Every day we use things that are controlled by electronics. Two examples are a video recorder and a fire alarm. List four more things that are controlled by electronics: 1. 2. 3. 4. Everyone of your examples will contain a number of electronic circuits which are referred to as a system. This system is made up of three stages: INPUT use sensors to get data about the outside world PROCESS change the data so that it can be used to do something OUTPUT using electricity and electronics to affect the world around us Every electronic system can be represented by a block diagram with at least these three blocks: EMBED MSDraw.1.01 An input to an electronic system consists of a sensor. Input sensors convert external information into an electronic signal. Sensors are available to sense changes in light, temperature, sound, pressure, moisture, position, orientation and proximity. An output from an electronic system consists of a transducer that converts electrical energy into some other form of energy so that they can do something or bring something to our attention. Examples would be light bulbs, buzzers, relays and loudspeakers. As well as showing electronic systems as block diagrams we often have to draw circuit diagrams. These use symbols to represent the individual components in a circuit. 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