By Owen Bishop
The fabric in Electronics - Circuits and platforms is a very updated textbook, with assurance conscientiously matched to the electronics devices of the 2007 BTEC nationwide Engineering and the newest AS and a degree requirements in Electronics from AQA, OCR and WJEC. the fabric has been equipped with a logical studying development, making it excellent for quite a lot of pre-degree classes in electronics.
The method is student-centred and comprises: quite a few examples and actions internet study subject matters Self try good points, highlighted key proof, formulae and definitions. each one bankruptcy ends with a collection of difficulties, together with exam-style questions and multiple-choice questions.
The e-book is now additionally supported via a spouse site that includes huge help for college kids and academics, together with solutions to the questions within the ebook, interactive workouts, additional math help and chosen illustrations from the e-book.
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Additional resources for Electronics - Circuits and Systems
Example text
11 Explain how a capacitor is used for (a) coupling and (b) decoupling. 12 Select a circuit that has a capacitor in it and explain what the capacitor does. 13 A 22 nF capacitor is charged through a 47 k resistor. Calculate the time constant. 14 In Question 13, what are we assuming about the voltage source? What are we not assuming about the voltage source? 15 In Question 13, how long does it take for the discharged capacitor to almost fully charge? How long does it take to charge to half the supply voltage?
The coil resistance is 14 . Design a switching circuit to energise the solenoid when the temperature rises above a given level. that it works. Extension questions 13 Why is the transconductance of a MOSFET expressed in Siemens, but the gain. of a BJT has no unit? 14 A MOSFET has a gm of 500 mS. if the gatesource voltage increases by 50 mV, what is the change in ID? 15 A BJT is to switch on a small DC motor that t a k e s 400 mA at 12 V. The current gain of the transistor is 250. What minimum base current is needed?
6 S, what change of gate voltage is needed to decrease I D by 400 mA? 23 Electronics — Circuits ami Systems Multiple choice questions 1 When used connected in: A B C D 2 switch, a BJT is Which of these features of a MOSFET is not of importance in a transistor switch? Visit the site and. see how these circuits work. high input resistance. low 'on' resistance. medium transconductance. low input capacitance. A light-dependent resistor is usually made from: silicon oxide. p-type semiconductor. cadmium sulphide.