(1)L2正常发光时的电阻;
(2)若只闭合开关S1,电源电压调节为10V,滑片P滑至中点时小灯泡正常发光,滑动变阻器的最大阻值;
(3)若不清楚电路中各开关闭合或断开的状态,滑动变阻器滑片P的移动范围为2Ω至最大阻值处,现移动滑片P同时调节电源电压,使电路中两个小灯泡均发光且有小灯泡正常发光,电路中各元件均安全工作,求对应电路总电功率的变化范围。
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