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在测定电源电动势和内阻的实验中,中学教材根据闭合电路欧姆定律(即E=U+I)r原理用伏安法测定,但是由于电压表的分流和电流表的分压,使得电源的电动势和内阻测量存在误差,现就此种方法测量误差分析如下这是课本上的学生实验电路图,只要测出两组U、I的值,就能算出电动势和内阻。对电路的接法可以这样理解:因为要测电源
In the determination of electromotive force and internal resistance of the experiment, the secondary school textbooks based on the closed circuit Ohm’s law (ie E = U + I) r principle voltammetry, but due to the voltage meter shunt and ammeter partial pressure, making the power electromotive force And internal resistance measurement error, this method is to measure the error analysis is as follows This textbook student experimental circuit, as long as the measured two sets of U, I value, we can calculate the emf and internal resistance. Connection to the circuit can be understood as this: because the power supply to be measured