(1)请用笔画线代替导线,将图甲的电路连接完整(滑片向左移动时电压表示数变大);
(2)闭合开关,发现灯泡不亮,电流表没有示数,电压表示数超量程,原因是
(3)小灯泡正常发光时的电流如图乙,有规格为“10Ω 2A”“20Ω 1A”和“50Ω 0.2A”的A、B、C三个滑动变阻器,小明应选择
(4)利用图甲装置
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