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Capacitance values for plastic-film units range from about 50 pF to several tens of microfarads. Most often they are in the range of 0.001 F to 10 F. Plastic capacitors are employed at AF and RF, and at low to moderate voltages. The efficiency is good, although not as high as that for micadielectric or air-dielectric units.

One other topic that should be covered before we conclude our discussion of LANs is logical design. Two designs have emerged over the years for LAN data management. The first is called peer-to-peer. In a peer-to-peer LAN, shown in Figure 4-24, all stations on the network operate at the same protocol layer, and all have equal access at any time to the shared medium and other resources on the network. They do not have to wait for any kind of permission to transmit; they simply do so. Traditional CSMA/CD is an example of this model. It is simple, easy to implement, and does not require a complex operating system to operate. It does, however, result in a free-for-all approach to networking, and in large networks it can result in security and performance problems. The alternative and far more commonly seen technique is called client-server. In a client-server LAN, all data and application resources are archived on a designated server that is attached to the LAN and is accessible by all stations (user PCs) with appropriate permissions, as

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204 Capacitance In this case, without even doing any calculations, you can say that the total is 100 F for practical purposes. The 100-pF unit is only a millionth of the capacitance of the 100- F component; therefore, the smaller capacitor contributes essentially nothing to the composite total.

Just as certain solids can be placed within a coil to increase the inductance, materials exist that can be sandwiched in between the plates of a capacitor to increase the capacitance. The substance between the plates is called the dielectric of the capacitor. Air works quite well as a dielectric. It has almost no loss. But it is difficult to get very much capacitance using air as the dielectric. Some solid material is usually employed as the dielectric for most fixed capacitors, that is, for types manufactured to have a constant, unchangeable value of capacitance. Dielectric materials conduct electric fields well, but they are not good conductors of electric currents. In fact, the materials are known as good insulators. Solid dielectrics increase the capacitance for a given surface area and spacing of the plates. Solid dielectrics also allow the plates to be rolled up, squashed, and placed very close together (Fig. 11-5). Both of these act to increase the capacitance per unit volume, allowing reasonable capacitances to exist in a small volume.

Electrolytic Capacitors All of the aforementioned types of capacitors provide relatively small values of capacitance They are also nonpolarized, meaning that they can be hooked up in a circuit in either direction An electrolytic capacitor provides greater capacitance than any of the preceding types, but it must be connected in the proper direction in a circuit to work right An electrolytic capacitor is a polarized component Electrolytic capacitors are made by rolling up aluminum foil strips, separated by paper saturated with an electrolyte liquid The electrolyte is a conducting solution When dc flows through the component, the aluminum oxidizes because of the electrolyte The oxide layer is nonconducting, and forms the dielectric for the capacitor The layer is extremely thin, and this results in a high capacitance per unit volume Electrolytic capacitors can have values up to thousands of microfarads, and some can handle thousands of volts.

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In the early days of radio, capacitors were commonly made by placing paper, soaked with mineral oil, between two strips of foil, rolling the assembly up, attaching wire leads to the two pieces of foil, and enclosing the rolled-up foil and paper in a cylindrical case.

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