实验七 测定金属的电阻率练习使用螺旋测微器正式版.docx

1、实验七 测定金属的电阻率练习使用螺旋测微器正式版() 11ABCDDEFB12FB0.5 mmDF0.5 mmE50F0.01 mm.0.01 mm.3,.()()()()0.01()1()(2)2231 mm.102050(mm)LNk(mm)(k)n(mm)1(1 mm)1090.10.1N()k20190.050.05N()k50490.020.02N()k1UUxUAIIxIVRRxRARxRRxRARxRVRx()()2(1)RxRx(2)Rx(3)3Pab3123RlSR.(1)R(R)4 图4 (2)lS.(3)(050 )1dS.233l.4UISIUSR51R(1)R(2)U

2、I2RldR.123412()345S6,I(00.6 A)7RRU/I(UI)15RRxRS12RxRRx.526R1Rx (1)S2S1RI1U1.(2)RS2I2U2.6(3)Rx.(1)(7)71140.1 mm11.40 mm11.4 mm(8)810120.05 mm10.6 mm10.60 mm(2)1231 mm.(9)9(540.05) mm5.20 mm(5040.05) mm50.20 mm(3)(10)1013100.05 mm13.50 mm14100.05 mm14.50 mm1(1)11图112019 mm._ cm.(2)12_ mm.12213L5 R(1)_

3、mm.13(2)A03 V10 kB015 V50 kC00.6 A0.05 D03 A0.01 E010 F0100 _()14141_2_.(1)()()()6 V0.6 WUI6 V.(2)(3)()()35 A(3 V1 )BA1(03 A0.012 5 )CA2(00.6 A0.125 )DV1(03 V4 k)EV2(015 V15 kFR1(020 1 A)GR2(02 000 0.3 A)H(1)_()(2)Rx_(3)d15_ mm. 图15(4)LdR_.22.16 II164(201122)A17A0R0RNSS1E17(1)S1S1_I(2)S2_RN(3)RN_1(201021()(1)18(a)_mm.(2)20(b)_cm.(a)(b)182.(1)2019_ mm(2)_ mm19(3)10