A.待测金属丝R(电阻约8Ω)
B.电流表A(0.6A,内阻约0.6Ω)
C.电压表V(3V,内阻约3kΩ)
D.滑动变阻器R1(0-5Ω,2A)
E.电源E(6V)
F.开关,导线若干
U/V | 12.9 | 12.3 | 11.0 | 7.8 | 5.2 |
R/Ω | 37.9 | 23.7 | 11.2 | 4.3 | 2.0 |
/A | 0.34 | 0.52 | 0.98 | 1.81 | 2.60 |