电路的基本概念,电路的作用与组成
作者:老电工时间:2022-11-01 17:37:10
电路即电流的通路,它是为了未种需要由不同的电气元件授一定的顺序用连接导线依次连接而成的。根据电流性质的不同,电路有且流电路和交流电路之分。电路的结构将以它所完成的任务不同而不同,简单的电路申儿个元件构成,复条的电路可申成和上万个元件构成。
图 1.1 电力系统电路示意图
例如城乡供
配电线路就是一种复杂电路,如图1.1所示,它的作用是实现电能的传输和转换。图1.2所示的手电简电路则为简单电路,它将电能转换为光能、热能。另一种是以收音机电路为典型代表的信号电路,用于信号的传递和处理。
电路的基本组成部分是:电源、负载和连接电源与负载的中间环节。
图 1.2 手电筒电路
电源:它是将其他形式的能量(化学能.机械能等)转换为电能的设备。电源分为直流电源(DC)和交流电闻(AC)两大类,在电路图中分别用"一”和”~“表示。章用的直流电源有
干电池蓄电池直流发电机,整流电源等。民用供配电网提供的是交流电源,由交流发电机产生。图1.3为常用电源的图形符号与文字符号。
图 1.3 常用 电源 的 符号
负载:它是取用电能的设备,将电能转换为其他形式的能量(如光能、热能、机械能等)。在电路图中一般负载用“
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”表示 ,符号 “Z” 表示阻抗 。
中间环节:它是连接电源与负载之间必不可少的环节,由导线.开关和实现控制.测量保护等功能的元件构成。其中用来传输和分配电能的导线是必不可少的,导线一般用包着绝缘层的铜线或铝线制成。