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学习物理,贵在把知识串起来,使知识融会贯通,脉络清晰,那么,找到串起各知识点的“绳”就非常重要.电学实验中,“探究电流与电压的关系”就是串起电学知识的绳.探究电流与电压的关系首先明确,研究电流与电压的关系,必须控制电阻一定,改变电压.通过什么方法改变电阻两端的电压呢?有两种方法,一是改变电源电压,例如,把电源电压调成2 V、4 V、6 V,此方法比较麻烦;二是可以在电路中串联一个滑动变阻器,观察调节
To study physics, it is very important to string together the knowledge so that the knowledge is coherent and clear, so it is very important to find the “string” that strikes each knowledge point. In electrical experiments, the relationship between the current and the voltage is Strings of electrical knowledge of the rope. Exploring the relationship between current and voltage First of all clear that the relationship between current and voltage, the resistance must be controlled to change the voltage. By what method to change the voltage across the resistor? There are two ways, one is to change the power Voltage, for example, the power supply voltage is adjusted to 2 V, 4 V, 6 V, this method is too much trouble; second is in the circuit in series with a sliding rheostat, observe the regulation