测定铜丝的电阻温度系数.

1、测定铜丝的电阻温度系数实验仪器与器材加热、控温、测温装置，漆包线绕制的铜线电阻（R25Q）, 2个滑线电阻（1750 Q、100Q），直流电流表（25100mA、0.5级），2个电阻箱（0.1级、1/4W），烧 杯，导线等。提示与要求1、关于电阻温度系数任何物质的电阻都与温度有关，多数金属的电阻随温度升高而增大，有如下关系：Rt Ro（1Rt），式中Rt,、Ro分别是tC、OC时金属的电阻值，R是电阻温度系数，其单位是C -1。 R一般与温度有关，但对于实验用的纯铜材料来说，在-50C100C的范围内，R的变化非常小，可当作常数，即 Rt与t呈线性关系。2、实验要求（1）实验前，按实验目的、实

2、验室提供的仪器、器材，结合前面的提示，设计出实验 画出装置示意图，标明各仪器名称， 设计出测量方法，拟定实验步骤和数据记录表格。实验方案经教师认可，连线后请老师检查，无误后才能进行实验。注意：水温不能超过80 C（2）数据处理 先用作图法计算 R 再用最小二乘法进行直线拟合（参阅第四章4），算出R，并求出相关系数r 要充分考虑仪器的安全，不可因电流过大而烧坏所用仪器。注意：本实验不要求计算不确定度。在屿o150C的温度范围内，洞电阻宵温度戚莹性关系，其电阻与温度关系的表达式为I n = h/R=R.Oa+Qt） 式中，度e时的电阻值；R0为温彥09时的电阻值；口值为锢的电阻温度系紀约齒 0.0

3、043n在加热座椅 后窗热线等純电阻电路中.尤其寰注意低溫时电阻的下降，从而导致电流过大的影吨.Pt100BA1BA2温度（C）阻值（Q）温度（C）阻值（Q）温度（C）阻值（Q）-20018.49-2007.95-20017.28-19022.80-1909.96-19021.65-18027.08-18011.95-18025.98-17031.32-17013.93-17030.29-16035.53-16015.90-16034.56-15039.71-15017.85-15038.80-14043.87-14019.79-14043.02-13048.00-13021.72-13047

4、.21-12052.11-12023.63-12051.38-11056.19-11025.54-11055.52-10060.25-10027.44-10059.65-9064.30-9029.33-9063.75-8068.33-8031.21-8067.84-7072.33-7033.08-7071.91-6076.33-6034.94-6075.96-5080.31-5036.80-5080.00-4084.27-4038.65-4084.03-3088.22-3040.50-3088.03-2092.16-2042.34-2092.04-1096.09-1044.17-1096.03

5、0100.00046.000100.0010103.901047.8210103.9620107.792049.6420107.9130111.673051.4530111.8540115.544053.2640115.7850119.405055.0650119.7060123.246056.8660123.6070127.077058.6570127.4980130.898060.4380131.3790134.709062.2190135.24100138.5010063.99100139.10110142.2911065.76110142.10120146.0612067.521201

6、46.78130149.8213069.28130150.60140153.5814071.03140154.41150157.3115072.78150158.21160161.0416074.52160162.00170164.7617076.26170165.78180168.4618077.99180169.54190172.1619079.71190173.29200175.8420081.43200177.03210179.5121083.15210180.76220183.1722084.86220184.48230186.3223086.56230188.18240190.45

7、24088.26240191.88250194.0725089.96250195.56260197.6926091.64260199.23270201.2927093.33270202.89280204.8828095.00280206.53290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600208.4529096.68290210.17212.0230098.34300213.79215.57310100.01310217.40219.12320101.

8、66320221.00222.65330103.31330224.56226.17340104.96340228.07229.67350107.60350231.60233.17360108.23360235.29236.65370109.86370238.83240.13380111.48380242.36243.59390113.10390245.88247.04400114.72400249.38250.48410116.32410252.88253.90420117.93420256.36257.32430119.52430259.83260.72440121.11440263.292

9、64.11450122.70450266.74267.49460124.28460270.18270.36470125.86470273.43274.22480127.43480277.01277.56490128.99490280.41280.90500130.55500283.80284.22510132.10510287.18287.53520133.65520290.55290.83530135.20530293.91294.11540135.73540297.25297.39550138.27550300.58300.65560139.79560303.90303.91570141.

10、31570307.21307.15580142.83580310.50310.38590144.34590313.79313.59600145.85600317.06发布者：佛山市普量电子有限公司发布时间：2010-04-08Cu50型热电阻分度表Cu50R(0C )=50.000 Q整 10 度电阻值 QC0102030405060708090050.00052.14454.28556.42658.56560.70462.84264.98167.12069.25910071.40073.54275.68677.83379.98282.134Cu100型热电阻分度表发布者：佛山市普量电子有限公司发布时间：2010-04-08Cu10