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The capacitor was originally called a condenser and it consisted of a glass jar with metal foil wrapped around its inside and outside. Wire electrodes were attached to the foil and then to a generator or other source of electricity. You could, for example, scu your feet on a carpet and touch one of the electrodes to charge the condenser. This glass jar condenser is called a Leyden jar, and was invented by Pieter van Musschenbroek from the University of Leyden in the Netherlands, and later improved by the English scientist William Watson. It was called a condenser because people thought that electricity was a uid and that this device condensed it. What it does is store an electric charge.
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Fig. 10-12.
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Capacitor.
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CHAPTER 10 Capacitance
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Leyden jars were used to store static electricity. Static electricity is highvoltage electricity. Static electricity shows up as a charge imbalance on the surface of an object and can even be collected on insulators. Once a charge is applied to one of its electrodes, the condenser remains charged until it is discharged. This voltage could leak away, carried o by little bits of moisture in the air, or it can be applied to a circuit. Touching both terminals together can create a spark. While it is easy to make, the Leyden jar can also be dangerous. Variations of this device are constructed for high-voltage equipment, such as Tesla coils.
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The modern capacitor is essentially the same as the Leyden jar, on a smaller scale. There are three parts to a capacitor. In the center there is an insulator, called the dielectric, meaning stu that won t conduct electricity. A dielectric is transparent to electrical e ects, such as the electric eld, but not the electrons themselves. On either side of the insulator is a thin electrode. An electrode is the point where electricity enters or leaves an electronic device, and all components have two or more. Attached to each electrode is a terminal wire which makes it easy to hook the capacitor into a circuit. Note how the schematic symbol in Fig. 10-12 re ects this internal construction. The electrodes and dielectric may be wrapped up into a tight cylinder. The inside and outside of this spiral electrode need to be separated by more dielectric so they don t short out.
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Now imagine the capacitor in a circuit such as the one in Fig. 10-13. At the start, there is a surplus of electrons on the battery side of the switch, crowded together and not happy about it. When the switch is pressed they are suddenly connected to the electrons on the other side, and promptly start to push them around. The electron pressure is increased all around the switch like the big shopping day after Thanksgiving. The capacitor, however, does not let the electrons through. The electrons in the pressurized parts of the circuit, including one electrode in the capacitor, are under a certain amount of pressure. They crowd together more
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Capacitance
Fig. 10-13.
Capacitor with charging switch.
than they would normally, and this increases the electric eld along the wires and, of interest here, at one of the electrodes in the capacitor. This electric eld has in uence through the dielectric and, though the electrons can t slip through, the electric eld pushes against the eld of the electrons on the other side. This, in turn, pushes those electrons away from the dielectric a little bit. In short, once the switch is pressed, there is a small jolt of current across the capacitor and then it all stops. If the switch is released the capacitor keeps its charge, so additional button pushes don t do anything until the capacitor is neutralized somehow, draining excess electrons from the crowded side of the dielectric. The result of this behavior is that the capacitor appears to conduct electricity while the voltage is changing, but does not conduct when the voltage is steady. If you apply an AC signal on one side of a capacitor, particularly one that goes negative as well as positive, a version of that signal will appear on the other side of the capacitor. The capacitor has a capacity, its capacitance as described in farads. This capacity determines how much of a charge it can hold. The capacitance, in conjunction with the frequency of the incoming signal, determines how e ciently that signal is transferred through the capacitor. There is one other detail. While many capacitors can be wired into a circuit in either direction, like a resistor, some capacitors have one terminal marked as positive. These polarized or electrolytic capacitors only work in one orientation. Wire them in backwards and they can fail, sometimes dramatically.
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