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An Introduction to Biomedical Instrumentation by D. J. Dewhurst (Auth.)

By D. J. Dewhurst (Auth.)

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SELECTION OF CAPACITOR TYPES Nature of dielectric Capacitance 1 Peak volts up to 5 0 0 0 0 1 μ¥ 001 01 1000 10,000 100,000 Peak volts above 5 0 0 PF 10 100 1 10 100 Peak volts up to 5 0 0 mica Γ polyester, y polycarbonate tantalum }electrolytic polyester, Y polycarbonate oil or [ oil-impregnated paper electrolytic electrolytic the whole capacitor is hermetically sealed to prevent drying. A variant of this principle is to use tantalum instead of aluminium; by partially fusing together fine beads of tantalum a very large surface area may be obtained in a small volume.

The current through the load will also be sinusoidal in form; it will be an alternating current, as in Fig. 5. R = IO O H M S F I G . 5. Alternating current in resistive load. C. Since power dissipated in a resistor is given at any instant by the product of voltage and current, it is possible to plot out the instantaneous power dissipated when the resistor is carrying an alternating current. Tabulating power for the example of Fig. 1. 1. If the instantaneous power is graphed, Fig. 6 results. The power curve is a sine wave, always positive, and twice the frequency of the voltage or current in the load.

Such simple generators appear in old-style manual telephones and bicycle lighting sets. f. available externally, some arrangement of sliding contacts must be used. A very simple example is seen in the telephone or bicycle generator, where one contact is made through the bearings of the rotating drum, (the rotor), and the other through an insulated spring contact. In larger machines a pair of slip rings is used, as shown in Fig. 4. F I G . 3. Two rotating conductors in series. ALTERNATING CURRENTS 39 F I G .

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