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苏科版九年级《物理》教材中,“焦耳定律”实验是一个重要的学生探究实验.教材中用控制变量法研究.1.研究“电热器电阻的大小对产生热量多少的影响”时,探究实验设计如下:将两个阻值不同的电阻圈,串联后接入电路,把火柴棒插入电阻圈中,火柴先被点燃的电阻圈温度升高得多,产生的热量也就多,实验电路如图1所示.2.研究“电流大小对产生热量多少的影响”时,探
In the 9th-grade “Physics” textbook of the Suko edition, the “Joule’s Law” experiment is an important student inquiry experiment. The textbook uses the control variable method to study. 1. When studying the effect of the size of the heater resistance on the amount of heat generated, Explore the experimental design is as follows: the resistance of the two different resistance ring, connected in series after the circuit, the matchstick inserted into the resistor ring, the resistance of the match is lit first, the temperature of the resistance ring is much higher, more heat is generated, the experiment The circuit is shown in Fig. 1. 2. When studying the effect of current size on the amount of heat generated,