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In electricity and electronics, there are many kinds of phenomena that involve other forms of energy besides electrical energy. Visible light is an example. A light bulb converts electricity into radiant energy that you can see. This was one of the major motivations for people like Thomas Edison to work with electricity. Visible light can also be converted into electric current or voltage. A photovoltaic cell does this. Light bulbs always give off some heat, as well as visible light. Incandescent lamps actually give off more energy as heat than as light. And you are certainly acquainted with electric heaters, designed for the purpose of changing electricity into heat energy. This heat is actually a form of radiant energy called infrared. It is similar to visible light, except that the waves are longer and you can t see them. Electricity can be converted into other radiant-energy forms, such as radio waves, ultraviolet, and X rays. This is done by things like radio transmitters, sunlamps, and X-ray tubes. Fast-moving protons, neutrons, electrons, and atomic nuclei are an important form of energy, especially in deep space where they are known as cosmic radiation. The energy from these particles is sometimes sufficient to split atoms apart. This effect makes it possible to build an atomic reactor whose energy can be used to generate electricity. Unfortunately, this form of energy, called nuclear energy, creates dangerous byproducts that are hard to dispose of. When a conductor is moved in a magnetic field, electric current flows in that conductor. In this way, mechanical energy is converted into electricity. This is how a
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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.
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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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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:
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A. There can be just a single atom of an element. B. There must always be two or more elements. C. The atoms are mixed in with each other but not joined. D. There is always a shortage of electrons. 8. An electrical insulator can be made a conductor: A. By heating. B. By cooling. C. By ionizing. D. By oxidizing. 9. Of the following substances, the worst conductor is: A. Air. B. Copper. C. Iron. D. Salt water. 10. Of the following substances, the best conductor is: A. Air. B. Copper. C. Iron. D. Salt water.
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