1. It is performed in AC or DC with voltages varying from some hundred volts to several tens of kilovolts. 交/直流电压，电压几百伏到数万伏可调。
2. This element generates high voltage sparks of several kilovolts, but with a very short duration and very low current. 此元件产生数千伏的高电压火花，但具有非常短的持续时间和非常低的电流。
3. Thus, you'll need to step up voltage to 745 kilovolts (which is a lot) so that wind doesn't lose all its energy in the transmitting process. 因此，为了保证在传输过程中不丢失全部能量，必须建设高达745千瓦（非常高）的变电站。
4. The tubes in which the rays were generated were known as Crookes tubes, which generated free electrons - then a topic of intense study - by applying a (DC) voltage of up to 100 kilovolts across a gap. 这些射线生成管也叫克鲁克斯管，通过在管道周围的裂缝处施加高达十万伏电压的方式，可以在其内部产生自由电子。
