论文部分内容阅读
小灯泡亮暗的分析与比较是物理学习中的难点,如何突破这个难点?首先应明确决定小灯泡亮暗的因素是什么. 电流流过小灯泡灯丝时,电流做功,电能转化为内能,灯泡灯丝的温度升高达到白炽状态而发光.小灯泡发光时灯丝的电阻可看作一定,因此,小灯泡的两端电压越高,通过的电流也越大,实际功率就越大,小灯泡越亮.反之,小灯泡越暗.
The analysis and comparison of light and dark light bulbs is a difficult point in physics learning. How to overcome this difficulty? First of all, it should be clearly decided what the light and dark light bulbs are. When current flows through a small light bulb filament, the current does work, and the electrical energy is converted into internal energy. The temperature of the bulb filament rises to reach the incandescent state and the light is emitted. The resistance of the filament can be considered as certain when the bulb is lighted. Therefore, the higher the voltage between the two ends of the bulb, the higher the current that passes, and the greater the actual power, the smaller the bulb. The brighter, the darker the light bulb.