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一、电流强度跟电压的关系,定量演示改进(即欧姆定律),这个实验,如果照初兰物理书上p,157上装上AB、CD两根不同质的导线。往往做不成功。我改用定值电阻(仪器编号(?)58)5Ω、10Ω代替AB、CD两根导线。因力阻(?)稳定,演示的结果正好说明导体的电流强度跟这端的电压成正比,达到绝对定量值。二、初三物理书p.129,把一块铜片和一块锌片浸在稀硫酸溶液里就组成了一个伏打电池,它可以向小灯泡供电,使小灯泡发光.但在演示过程中达不到预期效果,往往亮的时间很短促,只有几秒种,要第二次重
First, the relationship between current intensity and voltage, quantitative demonstration improvement (that is, Ohm’s law), this experiment, if according to the first orchid physical book p, 157 installed AB, CD two different quality wires. Often do not succeed. I switched to fixed resistance (instrument number (?)58) 5Ω, 10Ω instead of AB, CD two wires. Due to the resistance (?) stability, the results of the demonstration precisely show that the current intensity of the conductor is proportional to the voltage at this end, reaching an absolute quantitative value. Second, the third physical book p.129, a piece of copper and a piece of zinc soaked in dilute sulfuric acid solution to form a voltaic battery, it can supply power to a small bulb, so that a small light bulb. But in the demonstration process Less than expected results, often bright time is short, only a few seconds, to the second time