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1.如图1所示,将灯泡的灯芯接入电路时,电压表的指针_____;当用酒精灯对灯芯的玻璃柱加热一段时间后,电压表的指针就会______,这表明通常情况下是的玻璃,受热达到一定高温时也会变成,将图中的M、N跟废日光灯管中的钨丝连接,用酒精灯对钨丝加热后,电流表的示数_____,这表明钨丝的电阻随温度的升高而_______。
1. As shown in Figure 1, when the wick of the lamp is connected to the circuit, the pointer of the voltmeter _____; when the glass column of the wick is heated with the alcohol lamp for a period of time, the pointer of the voltmeter will be ______, which indicates that In the case of glass, when the heat reaches a certain high temperature, it will become. Connect the M and N in the figure with the tungsten wire in the waste fluorescent lamp. After heating the tungsten wire with the alcohol lamp, the current meter shows the number _____. It shows that the resistance of the tungsten wire increases with the temperature _______.