如图甲所示电路,小灯泡额定电压为5V,滑动变阻器
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmi%3E%0A++++R%0A+++%3C%2Fmi%3E%0A+++%3Cmn%3E%0A++++1%0A+++%3C%2Fmn%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmi%3E%0A++++R%0A+++%3C%2Fmi%3E%0A+++%3Cmn%3E%0A++++2%0A+++%3C%2Fmn%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
允许通过的最大电流均为1A,电压表量程为0~15V,电流表量程为0~0.6A,电源电压U保持不变。断开开关
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmi%3E%0A++++S%0A+++%3C%2Fmi%3E%0A+++%3Cmn%3E%0A++++2%0A+++%3C%2Fmn%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
,闭合开关
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmi%3E%0A++S%0A+%3C%2Fmi%3E%0A%3C%2Fmath%3E)
、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmtext%3E%0A++++S%0A+++%3C%2Fmtext%3E%0A+++%3Cmtext%3E%0A++++1%0A+++%3C%2Fmtext%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
,
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmi%3E%0A++++R%0A+++%3C%2Fmi%3E%0A+++%3Cmn%3E%0A++++1%0A+++%3C%2Fmn%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
的滑片从最右端逐渐滑向最左端过程中,小灯泡始终正常发光;保持
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmi%3E%0A++++R%0A+++%3C%2Fmi%3E%0A+++%3Cmn%3E%0A++++1%0A+++%3C%2Fmn%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
的滑片在最左端不动,断开开关
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmtext%3E%0A++++S%0A+++%3C%2Fmtext%3E%0A+++%3Cmtext%3E%0A++++1%0A+++%3C%2Fmtext%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
,闭合开关S、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmtext%3E%0A++++S%0A+++%3C%2Fmtext%3E%0A+++%3Cmtext%3E%0A++++2%0A+++%3C%2Fmtext%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
,在保证所有元件安全的情况下,将
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmi%3E%0A++++R%0A+++%3C%2Fmi%3E%0A+++%3Cmn%3E%0A++++2%0A+++%3C%2Fmn%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
的滑片从最右端向左进行最大范围移动。图乙中A~B是移动滑动变阻器
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmrow%3E%0A++%3Cmsub%3E%0A+++%3Cmi%3E%0A++++R%0A+++%3C%2Fmi%3E%0A+++%3Cmn%3E%0A++++1%0A+++%3C%2Fmn%3E%0A++%3C%2Fmsub%3E%0A+%3C%2Fmrow%3E%0A%3C%2Fmath%3E)
的滑片过程中电流表和电压表的示数关系图象,C~B是移动滑动变阻器
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%0A+%3Cmsub%3E%0A++%3Cmi%3E%0A+++R%0A++%3C%2Fmi%3E%0A++%3Cmn%3E%0A+++2%0A++%3C%2Fmn%3E%0A+%3C%2Fmsub%3E%0A%3C%2Fmath%3E)
的滑片过程中电流表和电压表的示数关系图象。(本题中小灯泡阻值会随着温度变化而变化)求:
![](http://tikupic.21cnjy.com/2021/07/08/65a804ce100032943ed757fb0cee0bff.png)