1000 watt. According to the Interim Provisions on Student Accommodation Management of North China University of Water Resources and Hydropower, high-power electrical appliances are not allowed in the design of power supply lines and distribution facilities in student dormitories, and the dormitory is limited to 1 1,000 watts. Voltage, also known as potential difference or potential difference, is a physical quantity to measure the energy difference of unit charge in electrostatic field due to different potentials.