电功电热某办公楼里总熔断器允许~

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方法一：总功率P=UI=220v×12A=2640w P=P1+P2+P3+P4+P5+P6 =2×100w+80w+2×500w+5×60w+1000w+n×60w =2580w+n×60w 上面两式相等,2580w+n×60w=2640w n=1(盏)方法二：干路的电流I=I1+I2+I3+I4+I5+I6 =P1/U+P2/U+P3/U+P4/U+P5/U+P6/U =（P1+P2+P3+P4+P5+P6)/U =(2×100w+80w+2×500w+5×60w+1000w+n×60w)/220v =12A n=1(盏)