My father is an electric engineer. (我父亲是电气工程师。)
My mother has bought an electrical iron. (我妈妈买了一个电熨斗。)
有人说，这两个句子都是错误的。但不知错误在什么地方。
应当牢牢记住: electric 是指“电产生的, 电(带)动的, 带电的”(produced by, worked by or charged with electricity) 或者“发电的”(producing electricity), 例如, an electric light(电灯), an electric fence(电网), an electric generator(发电机), electric power(电力, 电源), an electric shock(电击), an electric clock(电钟), an electric guitar(电吉他), an electric current(电流), an electric torch(手电筒)。
而 electrical 则是指“与电学有关的(人或物)(related to the subject of electricity)，例如，an electrical engineer(电气工程师)，electrical apparatus(电器)，an electrical fault(电气故障)，electrical engineering(电气工程)，electrical equipment(电气设备)。
请做下面的英语试题：
____ are fed into a tape recorder, they magnetize the particles on the tape in varying patterns. A. Electric waves B. When electric waves C. Because of electric waves D. Electric waves that (TOEFL)