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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

The DC Motor Magnetic forces can be harnessed to do work. One common device that converts direct-current energy into rotating mechanical energy is a dc motor. In a dc motor, the source of electricity is connected to a set of coils, producing magnetic fields. The attraction of opposite poles, and the repulsion of like poles, is switched in such a way that a constant torque, or rotational force, results. As the current in the coils increases, the torque that the motor can provide also increases. Figure 8-9 is a simplified, cutaway drawing of a dc motor. One set of coils, called the armature coil, rotates along with the motor shaft. The other set of coils, called the field coil, is stationary. The current direction is periodically reversed during each rotation by means of the commutator. This keeps the rotational force going in the same angular direction, so the motor continues to rotate rather than oscillating back and forth. The shaft is carried along by its own inertia, so that it doesn t come to a stop during those instants when the current is being switched in polarity. Some dc motors can also be used to generate dc. These motors contain permanent magnets in place of one of the sets of coils. When the shaft is rotated, a pulsating dc flows in the coil.

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Static electricity 15 When most of the charge carriers are electrons, the semiconductor is called N-type, because electrons are negatively charged. When most of the charge carriers are holes, the semiconducting material is known as P-type because holes have a positive electric charge. But P-type material does pass some electrons, and N-type material carries some holes. In a semiconductor, the more abundant type of charge carrier is called the majority carrier. The less abundant kind is known as the minority carrier. Semiconductors are used in diodes, transistors, and integrated circuits in almost limitless variety. These substances are what make it possible for you to have a computer in a briefcase. That notebook computer, if it used vacuum tubes, would occupy a skyscraper, because it has billions of electronic components. It would also need its own power plant, and would cost thousands of dollars in electric bills every day. But the circuits are etched microscopically onto semiconducting wafers, greatly reducing the size and power requirements.

Whenever there is movement of charge carriers in a substance, there is an electric current Current is measured in terms of the number of electrons or holes passing a single point in one second Usually, a great many charge carriers go past any given point in one second, even if the current is small In a household electric circuit, a 100-watt light bulb draws a current of about six quintillion (6 followed by 18 zeroes) charge carriers per second Even the smallest mini-bulb carries quadrillions (numbers followed by 15 zeroes) of charge carriers every second It is ridiculous to speak of a current in terms of charge carriers per second, so usually it is measured in coulombs per second instead A coulomb is equal to approximately 6,240,000,000,000,000,000 electrons or holes A current of one coulomb per second is called an ampere, and this is the standard unit of electric current.

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