(1)根据图甲用笔画线代替导线将图乙的实物图补充完整
(2)该实验的原理是
(3)某次测量时,电压表的示数为1.5V,电流表的示数为0.3A,则待测电阻的阻值为
(4)若撤去电压表和滑动变阻器,新增一个阻值为的定值电阻,利用如图丙所示的实验电路,也可以测量待测电阻的阻值。实验步骤如下:
①首先,闭合开关、,记录电流表的示数;
②接着,断开开关
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2