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我校１１个教室都采用日光灯照明，每个教室有４盏 ４０ Ｗ的日光灯．教室照明电路的总功率为 Ｒ总＝１１×４×４０ Ｗ＝１７６０ Ｗ； 干路电流为 Ｉ＝Ｐ总／Ｕ＝１７６０ Ｗ／２２０ Ｖ＝８ Ａ． 干路中选用额定电流为 １０ Ａ的熔丝．但是，额电流为 １０ Ａ的熔丝却经常被
All 11 classrooms in our school use fluorescent lighting, and each classroom has 4 to 40 W fluorescent lamps. The total power of the classroom lighting circuit is R=11×4×40 W=1760 W; the trunk current is I=P total/U=1760 W/220 V=8 A. Use a fuse rated at 10 A in the trunk. However, fuses with a current of 10 A are often