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Electric Engineering a hundred and one covers the fundamental thought and perform of electronics, beginning by way of answering the query "What is electrical energy? " It is going directly to clarify the elemental ideas and parts, touching on them continually to real-world examples. Sections on instruments and troubleshooting provide engineers deeper knowing and the knowledge to create and keep their very own digital layout initiatives.
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Electron flow can be induced by moving a wire near a magnet, or moving a magnet near a wire. This technique is called electromagnetic induction, and it works thanks to the close relationship between magnetism and electricity. We mention this relationship again in Chapter 5 when we discuss inductors. As the coil rotates inside the magnet, the magnet first causes the electrons to flow in one direction, but when the coil has rotated 180 degrees, the magnet pulls the electrons in the other direction and they go right back again.
The electronics also controls whether each beam is on or off as it sweeps past each pixel, so that the phosphor it’s aimed at gets bombarded by electrons or is left alone. When a beam of electrons strikes a phosphor, it glows. By co-ordinating the movement and on/off state of the so-called ‘red’, ‘blue’ and ‘green’ electron beams, the electronics in your TV creates colourful images on the screen. 35 36 Part I: Understanding the Fundamentals of Electronics Chapter 3 Meeting Up with Resistance In This Chapter ▶ Using resistance to your advantage ▶ Creating just the right amount of resistance with fixed and variable resistors ▶ Understanding how current, voltage and resistance are governed by Ohm’s Law ▶ Practising Ohm’s Law by analysing circuits ▶ Using power to guide you in choosing circuit components I f you toss a marble into a sandpit, the marble doesn’t go very far.
Standard-precision resistors can vary from 2 per cent to (gulp) 20 per cent of their nominal values. Markings on the resistor package tell you just how far off the actual resistance may be (for instance, ±2%, ±5%, ±10% or ±20%). Using standard-precision resistors in your circuits is okay 99 per cent of the time, because you’re usually using resistors to limit current and don’t need to ensure a precise current. Resistors with 5 or 10 per cent tolerance are commonly used in electronic circuits.
Central Electronics Multiphase Exciter 10B