(1)小灯泡正常发光时的电阻;
(2)断开开关S1,闭合开关S、S2、S3,将滑片P移到距a端的长度总长为ab的五分之二位置时,小灯泡L恰好正常发光,电源电压是多少?
(3)断开开关S2,闭合开关S、S1、S3, 将滑片P移到a端时,电流表示数为2A,此时电压表示数是多少?定值电阻R1的阻值是多少?
(4)假设各元件完好,若断开开关S1、S3,闭合开关S、S2,为不损坏元件,滑动变阻器接入电路的阻值范围是多少?
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