Everything Science Grade 12
CHAPTER 13. ELECTRODYNAMICS 13.4 (IEB 2001/11 HG1) - Work, Energy and Power in Electric Circuits Mr. Smith read through the agr ...
Electronics 14 14.1 Introduction ESCGA Electronics and electrical devices surround us indaily life. From the street lights and w ...
CHAPTER 14. ELECTRONICS 14.2 Time Current Voltage Figure 14.1: The voltage and current are in phase when a resistor is connected ...
14.2 CHAPTER 14. ELECTRONICS maximum voltage to maximum current is called the reactance — thistime inductive reactance (XL). The ...
CHAPTER 14. ELECTRONICS 14.2 current is called the impedance (Z), and its unit is also the ohm. Impedances are calculated using ...
14.2 CHAPTER 14. ELECTRONICS Example 1: The impedance of a coil QUESTION Calculate the maximumcurrent in a coil in a South Afric ...
CHAPTER 14. ELECTRONICS 14.3 Z = √ X^2 + R^2 = � 53 , 052 + 30^2 = 60,9 Ω Exercise 14 - 1 Why is the instantaneous value ofVIof ...
14.3 CHAPTER 14. ELECTRONICS the flow of DC and lowfrequency AC because its reactance increases with decreasing frequency. When ...
CHAPTER 14. ELECTRONICS 14.3 C L next part of circuit... Figure 14.6: A low passfilter. Low frequencies pass through the inducto ...
14.3 CHAPTER 14. ELECTRONICS The reactance of the inductor is 2 πfL, and the reactance of the capacitor is 1 / 2 πfC but with th ...
CHAPTER 14. ELECTRONICS 14.4 A radio station broadcasts at a frequency of 150 kHz. The tuning circuit in the ra- dio contains a ...
14.4 CHAPTER 14. ELECTRONICS A diode consists of twodoped semi-conductorsjoined together so that the resistance is low when conn ...
CHAPTER 14. ELECTRONICS 14.4 �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� ...
14.4 CHAPTER 14. ELECTRONICS The Light-Emitting Diode (LED) ESCGH A light-emitting diode (LED) is a diode devicethat emits light ...
CHAPTER 14. ELECTRONICS 14.4 status indicators, e.g.on/off lights on professional instruments and consumers audio/video equipme ...
14.4 CHAPTER 14. ELECTRONICS etc. Yellow LED lights are a good choice to meet these special requirements because the human eye i ...
CHAPTER 14. ELECTRONICS 14.4 semiconductor. This is shown in Figure 14.12. Similarly an PNP transistor consists of a very thin n ...
14.4 CHAPTER 14. ELECTRONICS Figure 14.13: An overview of bipolar transistors as current amplifiers.(Left) An NPN transistor. (R ...
CHAPTER 14. ELECTRONICS 14.4 pletion band, the narrower the channel. The narrower the channel, the harder it is for electrons to ...
14.4 CHAPTER 14. ELECTRONICS The Operational Amplifier ESCGJ The operational amplifier is a special kind of voltage amplifier wh ...
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