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高职电气自动化专业英语.pptx 20页

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Chapter 1 Electric and Electronic Technology FundamentalsUnit 1 Electric Elements and Components Text New Words and Expressions Exercises EndUnit1 Electric Elements and Components Introduction Electrical elements are conceptual abstractions used in the analysis of electrical networks. Any electrical network can be analyzed as multiple, interconnected electrical elements in a schematic diagram or circuit diagram, each of which affects the voltage in the network or current through the network.These ideal electrical elements represent real, physical electrical or electronic components but they do not exist physically and they are assumed to have ideal properties according to a lumped element model, while components are objects with less than ideal properties, a degree of uncertainty in their values and some degree of nonlinearity, each of which may require a combination ofUnit1 Electric Elements and Componentsmultiple electrical elements in order to approximate itsfunctions. Circuit analysis using electric elements is useful for understanding many practical electrical networks using components. By analyzing the way a network is affected by its individual elements it is possible to estimate how a real network will behave.Unit1 Electric Elements and Components The elements The four fundamental circuit variables are current, I; voltage, V, charge, Q; and magnetic flux, Φ. Only 5 elements, produced by manipulating these four variables, are required to represent any component or network in a Linear system.Two sources: · Current source, measured in amperes - produces a current in a wire. An ideal current source is a mathematical model, which real devices can only approach in performance. The current through an ideal current source is independent of the voltage across it.Unit1 Electric Elements and Components· Voltage source, measured in volts - produces a potential difference across two points. An ideal voltage source is only exists in mathematical models of circuits.

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