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一、知识梳理1.电路的组成电路就是用导线把电源、用电器、开关等元件连接起来组成的电流路径.(1)电源是把其他形式的能转化为电能的装置,电源的作用是持续提供电压.常见的电源有直流电源和交流电源,最常用的直流电源是电池,当直流电源对用电器供电时,电源外部的电流从电源的正极通过用电器流向负极,电源内部的电流从电源的负极流向正极,电源内、外部的电流形成闭合回路.
First, the knowledge of combing 1 circuit circuit is the use of wires to the power supply, electrical appliances, switches and other components connected to form the current path (1) power supply is to convert other forms of energy into the device, the role of power is sustained The common DC power supply and AC power supply, the most commonly used DC power supply is the battery, when the DC power supply to the electrical appliances, the external power supply current from the positive through the electrical appliances to the negative, the internal power supply current from the power supply Of the negative current to the positive, the power supply, external current to form a closed loop.