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伏安法测电阻的改进 |
[初3物理小论文] 摘 要 伏安法是物理实验及生产实际中测量电阻的一种方法。其测量电阻的原理是用电流表测出通过待测电阻的电流I,用电压表测出待测电阻两端的电压U,由公式 计算出待测电阻。伏安法测量电阻有电流表外接法和内接法之分。 伏安法测电阻常涉及电流表内、外接法的选择,同样一个待测电阻选择不同的接法测量产生的系统误差不同,测量结果也不同。根据不同的待测电阻值以及所用电压表、电流表的不同特性,应该选择不同的接法,以使得测量误差较小,这是伏安法测量电阻必须考虑的问题。本文重点介绍了伏安法测电阻的原理,伏安法内接法和外接法中实验误差的来源和大小,针对不同的待测电阻值和电压表、电流表的内阻选用不同的连接方法,既有理论探讨也有实验研究。针对伏安法测电阻存在较大的系统误差,对电路的改进也进行了理论探讨与实验研究。 关键词:伏安法;误差;电阻;改进;测量 Abstract Voltammetry is a method of measuring resistance in a physics experiment and production practice . Its measuring principle is to use an ammeter to measure currents through the resistance current ,whiling using a voltmeter to measure the voltage at the resistor , then calculate the measured resistance according the formula .Resistance measurement with ammeter has two circuit connection methods: inter-connected or exter-connected. Using the voltammetry we have to choose which way to connect , the same measured resistance but different selection of method of connecting measurement can make a different result.According to the different resistance to be measured and th……
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投稿人:是我 |
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最后编辑:ads888 |
初3物理小论文 | 初3物理小论文 |
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