(1)为保护电路元件安全,连接电路时开关应
(2)按图连接好电路后,闭合开关,将滑动变阻器的滑片P移到最左端时,灯不亮,电压表有较大的示数。经检查,导线连接完好,则电路故障是∶
(3)向右移动变阻器滑片P,会看到灯泡变
(4)实验中电压表示数如图所示,为测量灯泡的额定功率,应将滑动变阻器的滑片P向
(5)当小灯泡两端的电压为额定电压时,电流表的示数为0.3A,则小灯泡的额定功率为
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