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历来在中学物理和大学普通物理的习题中,都常有一些关于白炽灯的问题。其中,当涉及灯泡的电压或电流从额定值改变为其它值时,有的给了“假设灯泡灯丝阻值不受温度的影响”或“假定钨丝的阻值不变”之类的提示;而另一些却不加提示或说明,不言而喻地要求学生想当然地假设灯泡灯丝阻值是恒量,这似乎早已成为惯例。虽然近来渐有要求考虑灯泡钨丝电阻阻值与温度有关的问题,但为数不多。
There have always been some questions about incandescent lamps in the middle school physics and college general physics exercises. Wherein, when the voltage or current involving the bulb is changed from the rated value to another value, some of them give the assumption that the filament resistance of the bulb is not affected by the temperature, or that the value of the tungsten filament is not changed. While others do not provide hints or explanations, it goes without saying that students naturally assume that bulb filament resistance is a constant, which seems to have become the norm. Although there has been a recent demand to consider the temperature-related problems of the tungsten filament resistance of light bulbs, there are few.