经查是与四通阀线圈串联的控制继电器触点接触不良，电阻增大，致使电压降低。
The check is in the series of coil and four-way reversing valve control relay contact resistance increases, the bad, the contacts the voltage reduced.
当扼流线圈用作过滤器，它被串联连接在所述整流器的输出端，如图8 - 5所示。
When a choke coil is used as a filter, it is connected in series with the output of the rectifier, Figure 8-5.
差功变压器的次级线圈接成反向串联，以便在平衡时输出为零。
The differential transformer secondary windings are connected in subtractive series so that the output is zero at balance.
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