(1)连接电路时开关应处于___________(选填“闭合”或“断开”)状态。接通电路前,应将滑动变阻器的滑片P移动到阻值最大端;
(2)实验中调节滑动变阻器的滑片P到某一位置,观察到电压表和电流表的示数分别如图乙所示,其中电压表的读数为___________V,结合电流表的示数得到电阻的阻值___________Ω。
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