A.待测电阻RX:阻值约为200Ω |
B.电源E:电动势约为3.0V,内阻可忽略不计 |
C.电流表A1:量程为0~10mA,内电阻r1=20Ω; |
D.电流表A2:量程为0~20mA,内电阻约为r2≈8Ω; |
A.换用“×1 k”挡,不必重新调整调零旋钮 |
B.换用“×10”挡,不必重新调整调零旋钮 |
C.换用“×1 k”挡,必须重新调整调零旋钮 |
D.换用“×10”挡,必须重新调整调零旋钮 |
A.直流电源3V(内阻可不计) | B.直流电流表0 -3A(电阻约0.1Ω) |
C.直流电流表O- 600mA(内阻约0.5Ω) | D.直流电压表0-3V(内阻约3kΩ,) |
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