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By Charles Taylor

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However, if all twelve resistors are equal, the corner-to-corner resistance is 5/6 of any one of them. Technology Carbon composition resistors consist of a solid cylindrical resistive element with embedded wire leadouts or metal end caps to which the leadout wires are attached, which is protected with paint or plastic. The solid cylindrical resistive element is made from a mixture of small particles of carbon and an insulating material (usually ceramic), the resistance is determined by the ratio of these, higher concentrations of carbon result in a lower resistance.

Under absolute zero conditions the Fermi energy can be thought of as the energy up to which available electron states are occupied. 5. The dependence of the electron energy distribution on temperature also explains why the conductivity of a semiconductor has a strong temperature dependency, as a semiconductor operating at lower temperatures will have fewer available free electrons and holes able to do the work. Energy-momentum dispersion In the preceding description an important fact is ignored for the sake of simplicitythe dispersion of the energy.

The aluminium cased types are designed to be attached to a heatsink to dissipate the heat, the rated power is dependant on being used with a suitable heatsink. eg. a 50W power rated resistor will overheat at around one fifth of the power dissipation if not used with a heatsink. Types of resistors: • • Carbon composition Carbon film Metal film Metal oxide Wirewound (usually has higher parasitic inductance) Cermet Phenolic • Tantalum • • • • • Foil resistor Foil resistors have had the best precision and stability ever since they were introduced in 1958 by Berahard F.

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