并联电路中总电流怎么算?等于什么? 电流的计算方法(串联和并联,详细点)
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I总=I1+I2+I3+……+In。 I总=U÷R总。
并联电路中总电流可以有两种计算方法:
一、首先分别根据 I1=U/R1、I2=U/R2、I3=U/R3,……,In=U/Rn 计算各支路电流,然后再把各支路电流相加得到 I总=I1+I2+I3+……+In。
二、首先根据计算并联电路总电阻R总,再根据总电压U除以总电阻R总,求得总电流。
在并联电路中,各电阻两端的电压相等,各电阻上的电流之和等于总电流(干路电流)。可知每个电阻上的电流小于总电流(干路电流),故并联电阻分流。 电阻的串并联就好像水流,串联只有一条道路,电阻越大,流的越慢,并联的支路越多,电流越大。
扩展资料:
并联是将二个或二个以上二端电路元件中每个元件的二个端子,分别接到一对公共节点上的连接方式,n个二端元件的并联。它们都接到一对公共节点之上,这对节点再分别与电路的其他部分连接。
并联电路的特点主要有:
(1)所有并联元件的端电压是同一个电压,即图示电路中的V。
(2)并联电路的总电流是所有元件的电流之和。图示电路中,i是总电流,i1、i2、i3分别是元件1、2、3的电流,i=i1+i2+i3。
实例:民用照明灯泡都是并联接到220V额定电压的电源上,因此每只灯泡所承受的电压均为220V,而外电路的总电流则是流过所有灯泡的电流之和。
参考资料:百度百科——并联电路
并联电路总电流等于各个支路电流之和
并联电路中的总电流等于各分电流之和
总电流等于各支路电流之和
探究:并联电路中的电流关系
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