Ignition coil primary winding. Current flow through the coil produces an electromagnetic field, which is used to induce a high voltage in the secondary coil.
点火线圈初级绕组。电流通过线圈，产生一个电磁场，用来在次级线圈中产生高电压。
Similarly, a current transformer is connected with its primary in the high-voltage circuit.
同样，电流互感器是与它的主要的高电压电路。
The primary circuit is the low-voltage side of the system and controls the secondary circuit, which is the high-voltage side of the system.
初级回路是系统的低压端，并控制这次级回路，而次级回路是系统的高压端。
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