078螺旋测微器、游标卡尺和电压表、电流表的读数 精讲精练-2022届高三物理一轮复习疑难突破微专题
078螺旋测微器、游标卡尺和电压表、电流表的读数一.必备知识(一) 螺旋测微器 1.构造:如图甲所示,B为固定刻度,E为可动刻度。2.用途:测量厚度、长度、外径。3.原理:测微螺杆F与固定刻度B之间的精密螺纹的螺距为0.5mm,即旋钮D每旋转一周,F前进或后退0.5mm,而圆周上的可动刻度E有50个等分刻度,因此可动刻度每旋转一格,F前进或后退0.01mm,即螺旋测微器的精确度为0.01mm。读数时估读到毫米的千分位上。4.读数:测量值(mm)=固定刻度数(mm)(注意半毫米刻度线是否露出)+可动刻度数(估读一位)×0.01(mm)。如图乙所示,固定刻度示数为2.0mm,半毫米刻度线未露出,而...
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