某学校每间教室都有6盏40W的日光灯，由于同学们注意节约用电，做到人走灯熄，这样平均每天每盏灯少开半小时，那么该教学大楼每间教室的日光灯每天少用电______度．
教室里6盏灯的总功率：W=40W×6=240W=0.24kW，
总时间：t=0.5h×30=15h，
节约的电能：W=Pt=0.24kW×15h=3.6kW•h=3.6度．
故答案为：3.6．
Stone Field Country Park is in the south of Guangzhou. The Visitor’s Center is open from 9:30 to 16:30 every day. At the center you can get maps whit information about the location(位置) of public toilets, car parks, first-aid stations(急救站), barbecue(BBQ) places, shopping centers and public telephones in the park. Main Attractions We are proud of the Plant Garden. You can see thousands of different kinds of plants here. For sports lovers, a visit to our Sports Center is something you must do. Have fun with rope(绳子) walks, rock climbing and many other fun games. A Note to Visitor Please remember that fire is only allowed in the barbecue places. So enjoy your BBQ meals there! Come and enjoy a day full of fun at Stone Field Country Park!
|