CT (Current Transformer) Current transformers are instrument transformers used in conjunction with ammeters, control circuits and protective relaying. They usually have 5 ampere secondaries.
电流互感器 电流互感器是一种仪表变压器，通常与电流表、控制电路、保护继电器配套使用。

Circuit A circuit is a path for an electric current across a potential (voltage).
电路 电路是电流通过电势（电压）的路径。

Circuit Breaker A circuit breaker is a protective device that automatically interrupts the current flowing through it when that current exceeds a certain value for a specified period of time. See Air Circuit Breaker, Main Breaker, Molded Case Circuit Breaker and Power Circuit Breaker.
断路器 线路断路器是一个保护装置，当通过它的电流超过某个安全设定值一定时间后，它就能够自动切断电流。（见空气线路断路器、主开关、塑壳线路断路器等）。

Circulating Harmonic Currents Circulating Harmonic Currents are currents that flow because of differences in voltage waveforms between paralleled power sources, or induced by operation of non-linear loads.
谐波环流 谐波环流是由并联电源间不同的电压波形或者非线性负荷运转而产生的电流。

Continuous Load A continuous load is a load where the maximum current is expected to continue for three hours or more (as defined by the NEC for design calculations).
持续负荷 持续负荷是指使电流在3个小时或更长时间（根据NEC的定义）内需保持最大值的负荷。

Current Current is the flow of electric charge. Its unit of measure is the ampere.
电流 电流是电荷的流动，以安培为单位。

Cycle A cycle is one complete reversal of an alternating current or voltage from zero to a positive maximum to zero again and then from zero to a negative maximum to zero again. The number of cycles per second is the frequency.
周期 周期是指交流电流或电压从零到正最大值再到零，然后从零到负最大值再到零这样一个往复的过程；而频率则是指每秒可完成的周期数。