The power supply circuit of school dormitory is designed and installed according to small demand and low power. The maximum load that each dormitory can bear is about 1 1,000 watts (the design of each school is different), which can only meet the daily electricity consumption of lighting, drinking fountains and computers. If it is a university dormitory, if an electric meter is installed independently to measure the electricity consumption, generally, appliances below 2000 watts can be used. Unified power supply in junior and senior high school dormitories. High-power electrical appliances, such as hair dryers, can't be used in dormitories, because many dormitories only have 3A or 4A air inlet switches, which can only use a few hundred watts, while hair dryers need at least 1000 watts and will trip automatically.