This programme is in two parts. Part 1 is a brief review of the course and Part 2 is specifically linked to CU 6, on Transient Response of simple RC circuits.
|Module code and title:
|TS282, Electromagnetics and electronics
|First transmission date:
|Restrictions on use:
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|Gary Alexander; David Crecraft; Dennis Moss
|BBC Open University
|Amplifier; Design studies; Electronic curve tracer; Generatorscope; RC circuit; Signal processing; Transient and sinusoidal signal; Water analogy
|David Crecraft introduces the programme. He recalls the concepts which were covered in the first 5 units and shows some of the experimental apparatus used. Gary Alexander previews units 6-9. These will be concerned with the way electronic components work together when connected in circuits. Shots of various circuit diagrams. D. Crecraft previews material to be covered in units 10-19. These will be concerned with building electronic apparatus and doing design studies. He gives examples from: Unit 10 - Power supply. Circuit diagram for for a power supply is shown. Unit 16 - Tape recorder. Crecraft uses a circuit diagram of a tape recorder to explain its components. Shot of a commercial curve tracer which is displaying transistor curves. This will be covered in the last unit. Part 2 of TS 282/06 - Title: Transient response. Crecraft introduces Part 2 which will examine transience in resistance capacitance circuits. He uses a diagram of an RC circuit to explain the electrical quantities involved. He then introduces the water model. Gary Alexander with a water capacitor as an analogue for an electric capacitor. He demonstrates why only an AC current can be passed through a capacitor. G. Alexander with a complete water circuit analogue (RC circuit). He points out individual components on the model and relates these to corresponding parts of an electric RC circuit. Shot of an electric circuit diagram superimposed over the model. Alexander explains the experiment to monitor pressure and current in the water analogue. Alexander switches on the analogue. Pressure is monitored on a pen recorder chart. Current is shown by flow of water from a tap. The experiment demonstrates the relation of current to pressure. Crecraft relates the water analogue information to an electric RC circuit. He uses an RC circuit diagram and explains the pressure curve which is obtained, in electrical terms. Alexander with the water circuit analogue again. He changes the resistance of the circuit (turns a valve) and monitors the effect of this on pressure and current. Dennis Moss with an electronic RC circuit which he will use to observe the performance of a capacitor in an electronic RC circuit. He points out the components of the circuit. The circuit is monitored with an oscilloscope. An increase of voltage across the capacitor is measured on the oscilloscope. The tracings are super-imposed over the circuit so that both can be seen. Crecraft with RC circuit diagram. He explains why a rise in resistance causes current to rise at a lower rate. Crecraft introduces an earth switch to the diagram. He explains what happens when the circuit is discharged. Crecraft draws the input curve and capacitor voltage curve for a discharged RC circuit. Dennis Moss with an electronic RC circuit as built by students at home. The circuit is hooked to an oscilloscope. Moss explains the problems of adjusting the oscilloscope which students may have experienced and tells them how to solve them.
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