众所周知,串联电路中的各元件间相互影响,某一元件处断开,随之其它元件中也就不再有电流通过;而并联电路中各元件间相互独立、互不干扰,某一支路元件处断开,其它元件中仍能有电流通过。因此,我们可用“断开法”识别电路中各元件间的连接关系。 例1 如图1所示,电路中的两只小灯泡L_1和L_2 As we all know, each element in the series circuit affects each other, one element is disconnected, and then no other current passes through in other elements. However, each element in the parallel circuit is mutually independent and does not interfere with each other. The component is disconnected and current can still flow through the other components. Therefore, we can use “disconnect method” to identify the connection relationship between the components in the circuit. Example 1 As shown in Figure 1, two small bulbs L_1 and L_2 in the circuit