IMG_20191022_095808.jpg - OHM'S LAW POWER And ENERGY ObjECTIVES Understand the importance of Ohm's law and how to apply it to a variety of situations Be

# IMG_20191022_095808.jpg - OHM'S LAW POWER And ENERGY...

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Unformatted text preview: OHM'S LAW, POWER, And ENERGY ObjECTIVES . Understand the importance of Ohm's law and how to apply it to a variety of situations. Be able to plot Ohm's law and understand how to "read" a graphical plot of voltage versus current. . Become aware of the differences between power and energy levels and how to solve for each. Understand the power and energy flow of a system, including how the flow affects the efficiency of operation. Become aware of the operation of a variety of fuses and circuit breakers and where each is employed. 4.1 INTRODUCTION Now that the three important quantities of an electric circuit have been introduced, this chapter reveals how they are interrelated. The most important equation in the study of electric circuits is introduced, and various other equations that allow us to find power and energy levels are discussed in detail. It is the first chapter where we tie things together and develop a feeling for the way an electric circuit behaves and what affects its response. For the first time, the data provided on the labels of household appliances and the manner in which your electric bill is calculated will have some meaning. It is indeed a chapter that should open your eyes to a wide array of past experiences with electrical systems. 4.2 OHM'S LAW As mentioned above, the first equation to be described is without question one of the most important to be learned in this field. It is not particularly difficult mathematically, but it is very powerful because it can be applied to any network in any time frame. That is, it is ap- plicable to de circuits, ac circuits, digital and microwave circuits, and, in fact, any type of ap- plied signal. In addition, it can be applied over a period of time or for instantaneous responses. The equation can be derived directly from the following basic equation for all physical systems: Effect = cause opposition (4.1) Every conversion of energy from one form to another can be related to this equation. In electric circuits, the effect we are trying to establish is the flow of charge, or current. The potential difference, or voltage, between two points is the cause ("'pressure"), and the opposi- tion is the resistance encountered. An excellent analogy for the simplest of electrical circuits is the water in a hose connected to a pressure valve. as discussed in Chapter 2. Think of the electrons in the copper wire as the water...
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