在交流电路中,交流电流表测量交流电流的有效值,如果一周期内各支路与干路的通电时间相同,干路上电流表示数等于各支路电流表示数之和;如果一周期内有任意一个支路通电时间与干路的通电时间不同(如干路是全波,支路是半波),则干路上电流表示数就不等于各支路电流表示数之和了。 In the AC circuit, the AC ammeter measures the effective value of the AC current. If the power supply time of each branch and the trunk is the same in one cycle, the number of current representations on the trunk is equal to the sum of the current representations of each branch. If there is any A branch power on time and trunk power on time is different (such as the main road is full-wave, branch is half-wave), then the number of current on the road is not equal to the number of each branch of the sum of current representation.