gc textbook chapter 13 temperature and kinetic theory (id: e2d661f76)

本题目来源于试卷: gc textbook chapter 13 temperature and kinetic theory，类别为 通用国际物理

[问答题]
Figure 13–27 shows a diagram of a simple thermos0n6vgs aai30pu*u) * q-rjxz dtat used to cohzg bo7ckp.9 ,c 4srhlg *w+9pntrol a furnace (or other heating or cooling system). The bimetallic strip consists woph9 *g .gchl9b +sk rp7,z4cof two strips of different metals bonded together. The electric switch is a glass vessel containing liquid mercury that conducts electricity when it can flow to touch both contact wires. Explain how this device controls the furnace and how it can be set at different temperatures.

参考答案:
The device controls the furnace by the expansion and contraction of the bimetallic strip.  As the temperature increases, the strip coils more, and as the temperature decrease, the strip coils less.  As the strip changes shape, it will move the liquid mercury switch.  In the diagram, if the switch were tilted more to the right, the mercury would move and make contact between the heater wires, turning on the heater.  By adjusting the temperature setting lever, the tilt of the mercury switch is changed, and a different amount of temperature change is needed to tilt the switch to the on (or off) position.


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