A.当cd端短路时,ab之间的等效电阻是40Ω |
B.当ab端短路时,cd之间的等效电阻是40Ω |
C.当ab两端接通测试电源时,cd两端的电压为80V |
D.当cd两端接通测试电源时,ab两端的电压为80V |
R2R3 |
R2+R3 |
R1R3 |
R1+R3 |
R3 |
R3+R1 |
R3 |
R2+R3 |
A.小灯泡L1、L3变暗,L2变亮 |
B.小灯泡L2、L3变暗,L1变亮 |
C.△U1<△U2 |
D.△U1>△U2 |
A.内能增大,压强不变 | B.内能不变,压强不变 |
C.内能增大,压强增大 | D.内能不变,压强增大 |
A.R1 | B.R2 | C.R3 | D.R4 |
A.R1断路 | B.R1短路 | C.R2短路 | D.R3短路 |
A.小灯泡L1、L2均变暗 |
B.小灯泡L1变亮,L2变暗 |
C.电流表A的读数变小,电压表V的读数变大 |
D.电流表A的读数变大,电压表V的读数变小 |
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