For instance, too little electricity, caused by a brownout or blackout, may cause the loss of data in primary storage. 例如，电压不足或断电引起的电流过小，可能造成主存储器中的数据丢失。
Were there no transformers to adjust the voltage, long-distance transmission of electricity would be impossible. 若无变压器来调节电压，远距离输送电力是不可能的。
