Hair dryers are generally not allowed in university dormitories. Because most hair dryers belong to high-power appliances, in order to use electricity safely, high-power appliances are not allowed in the dormitory. But there are also school dormitories located in the first-level management office. The power of hair dryer is mainly the power of heating cable, and the power of personal hair dryer is generally around kW. Generally speaking, the electricity in university dormitories is between 500 and 800.