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Quiz 19 generator works. Generators can also work backwards. Then you have a motor that changes electricity into useful mechanical energy. A magnetic field contains energy of a unique kind. The science of magnetism is closely related to electricity. Magnetic phenomena are of great significance in electronics. The oldest and most universal source of magnetism is the flux field surrounding the earth, caused by alignment of iron atoms in the core of the planet. A changing magnetic field creates a fluctuating electric field, and a fluctuating electric field produces a changing magnetic field. This phenomenon, called electromagnetism, makes it possible to send radio signals over long distances. The electric and magnetic fields keep producing one another over and over again through space. Chemical energy is converted into electricity in all dry cells, wet cells, and batteries. Your car battery is an excellent example. The acid reacts with the metal electrodes to generate an electromotive force. When the two poles of the batteries are connected, current results. The chemical reaction continues, keeping the current going for awhile. But the battery can only store a certain amount of chemical energy. Then it runs out of juice, and the supply of chemical energy must be restored by charging. Some cells and batteries, such as lead-acid car batteries, can be recharged by driving current through them, and others, such as most flashlight and transistor-radio batteries, cannot.

Refer to the text in this chapter if necessary. A good score is at least 18 correct answers out of these 20 questions. The answers are listed in the back of this book. 1. The atomic number of an element is determined by: A. The number of neutrons. B. The number of protons. C. The number of neutrons plus the number of protons. D. The number of electrons. 2. The atomic weight of an element is approximately determined by: A. The number of neutrons. B. The number of protons. C. The number of neutrons plus the number of protons. D. The number of electrons. 3. Suppose there is an atom of oxygen, containing eight protons and eight neutrons in the nucleus, and two neutrons are added to the nucleus. The resulting atomic weight is about: A. 8. B. 10. C. 16. D. 18.

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Trimmer Capacitors When it is not necessary to change the value of a capacitor very often, a trimmer can be used. It consists of two plates, mounted on a ceramic base and separated by a sheet of plastic, mica, or some other solid dielectric. The plates are flexible, and can be squashed together more or less by means of a screw (Fig. 11-9). Sometimes two sets of several plates are interleaved to increase the capacitance. Trimmers can be connected in parallel with an air variable, so that the range of the air variable can be adjusted. Some air-variable capacitors have trimmers built in. Typical maximum values for trimmers range from a few picofarads up to about 200 pF. They handle low to moderate voltages, are highly efficient, and are nonpolarized. Coaxial Capacitors You recall from the previous chapter that sections of transmission lines can work as inductors. They can act as capacitors, too. If a section of transmission line is less than 1 4 wavelength long, and is left open at the far end (rather than shorted out), it behaves as a capacitor. The capacitance increases with length. The most common transmission-line capacitor uses two telescoping sections of metal tubing. This is called a coaxial capacitor. It works because there is a certain effective surface area between the inner and the outer tubing sections. A sleeve of plastic dielectric is placed between the sections of tubing, as shown in Fig. 11-10. This allows the capacitance to be adjusted by sliding the inner section in or out of the outer section.

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20 Basic physical concepts 4. An ion: A. Is electrically neutral. B. Has positive electric charge. C. Has negative electric charge. D. Might have either a positive or negative charge. 5. An isotope: A. Is electrically neutral. B. Has positive electric charge. C. Has negative electric charge. D. Might have either a positive or negative charge. 6. A molecule: A. Might consist of just a single atom of an element. B. Must always contain two or more elements. C. Always has two or more atoms. D. Is always electrically charged. 7. In a compound:

Coaxial capacitors are used in RF applications, particularly in antenna systems. Their values are generally from a few picofarads up to about 100 pF.

sent to it that could be turned around and retransmitted back to Earth with far greater coverage than was achievable through terrestrial transmission techniques. His platform would orbit at an altitude of 42,000 kilometers (25,200 miles) above the equator where it would orbit at a speed identical to the rotation speed of the Earth. As a consequence, the satellite would appear to be stationary to Earth-bound users. Satellite technology may prove to be the primary communications gateway for regions of the world that do not yet have a terrestrial wired infrastructure, particularly given the fact that they are now capable of delivering broadband services. In addition to the United States, the largest markets for satellite coverage are Latin America and Asia, particularly Brazil and China.

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