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常见的家庭电路一般由进户线、电能表、总开关、保险设备、用电器、插座、导线等组成.进户线分为火线和零线,它们用试电笔来判别,能使试电笔的氖管发光的是火线,不能使氖管发光的是零线.
Common home circuits generally by the entry line, watt-hour meter, the main switch, insurance equipment, electrical appliances, sockets, wires, etc. Into the line is divided into FireWire and zero line, they use the test pencil to determine, can make test pencil Neon tube is the hot line of light, can not make the neon tube glow is the zero line.