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* See note 5 in Appendix.
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CHAPTER 2 Electric Current. Ohm s Law
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The neutron is also one of the basic building blocks of which atoms are composed. Neutrons have the same mass as protons, but are electrically neutral particles. Since electrons and protons carry the same magnitude of charge, but of opposite sign, it follows that an electrically neutral atom or molecule has equal numbers of electrons and protons. We thus conceive that atoms of all materials are composed of electrons, protons, and neutrons. The relatively massive protons and neutrons are concentrated in the form of a nucleus in the center of the atom, while the electrons revolve or vibrate in di erent orbits or energy levels around the nucleus. In the atoms of some substances, the electrons in the outer orbits, farther from the nucleus, are only loosely bound to the nucleus, and such atoms can readily gain or lose electrons. If a normally neutral atom or molecule has gained or lost electrons, it is said to be an ion ( eye on ), being a positive ion if it has lost electrons and a negative ion if it has gained electrons. It is not, however, our intention or need to go into details of atomic structure here. All we wish to do, right now, is to point out that what we call electric current can be a ow of electrons, ions, or a combination of electrons and ions, depending on the substance we re dealing with. In the case of metals, the electric current is largely a ow of free electrons that have become detached from the atoms of the metal. Thus, good conductors, such as silver and copper, are materials in which the electrons are easily detached from the atoms of the substance. On the other hand, a poor conductor (good insulator) is a substance, such as rubber or porcelain, in which the electrons are tightly bound to the atoms and molecules and hence are not available for current ow. In the cases of liquids and gases, the current ow is mainly by means of ions, which can be either positive or negative, or a combination of ions and electrons. The foregoing naturally brings up the question of the direction in which electric current actually ows in a conductor. To answer that question we begin with a discussion of how we can detect the passage of electric current through a conductor. First, as you would expect, it requires an expenditure of energy, that is, work has to be done to force the passage of electric charge through a conductor. This energy must, of course, come from some kind of source capable of doing work. You might ask, What happens to the work that is supplied to force electric charge to ow in a conductor The answer is that it may be transformed into mechanical energy (by means of a motor), or into radiant energy (as from a light bulb), or into chemical energy (in the formation of a battery), and so on, but at least a portion of the work will always be transformed into heat energy in the conductor, and this will of course cause the temperature of the conductor to rise. The point to be made here is simply that one way of detecting the passage of electric current through a conductor is to sense any rise in temperature of the conductor. In addition to the temperature e ect, we also nd that electric current always establishes a magnetic eld around any conductor through which it is owing. This is a fact of very great importance, and one we will investigate in detail later on. Right now, however, we merely wish to point out that another way of detecting the passage of electric current through a conductor is to detect the presence of a magnetic eld around the conductor. Now consider the following. Imagine we have a long piece of rubber tubing, and we are told that the tube contains a conductor of electricity throughout its length. However, we cannot see inside the tube, and so we do not know whether it contains a solid metallic conductor (such as a copper wire), or some kind of a liquid or paste conductor (a dilute solution of any kind of acid, for instance).
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