Electrical power is related to the product of the voltage and current in a transmission line.

电功率与传输线上的电压和电流的乘积有关。

Since the voltage and current peaks occur at the same time, the two are said to be in phase.

由于电压峰值和电流峰值 同时出现，因此称两者同相。

When you talk about direct current circuits, describing the voltage and current in a given situation is pretty straightforward.

当您谈论直流电路时，描述给定情况下的电压和电流非常简单。

Finally, we saw how to measure voltage and current in a real circuit using voltmeters and ammeters.

最后，我们了解了如何使用电压表和电流表测量实际电路中的电压和电流。