一太阳能电池板，测得它的开路电压为800 mV，短路电流为400 mA，若将该电池板与一阻值为1.2Ω的电阻器连成一闭合电路，则它的路端电压是
A．0.10 V
B．0.20 V
C．0.30 V
D．0.40 V
答案：C
它的开路电压为800 mV，短路电流为400 mA，所以电池板的内阻为
所以它与阻值为1.2Ω的电阻器连成一闭合电路后，它的路端电压为
,C正确，
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