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02年全国高考理科综合卷(江西、天津卷)第19题:在三相交流电源上按星形接法连接相同的负载1、2、3,如图1,NN’是中性线.已知负载1上的电压为220V,电流强度为15A.现以I表示中性线上的电流,U表示图中P、Q两点之间
2002 national college entrance examination science synthesis volume (Jiangxi, Tianjin volume) Question 19: connected to the same load on the three-phase AC power supply star connection method 1,2,3, as shown in Figure 1, NN’ is a neutral line. Know that the voltage on the load 1 is 220V, the current intensity is 15A. Now the current on the neutral line is I, and U is the P and Q points in the figure.