(1)小明按电路图连接实物,刚接上最后根导线,看到电流表指针立刻有偏转。若电路连线正确,造成这种异常现象的原因是
(2)实验中,调节滑动变阻器,分别记录电压表和电流表的示数如下:
测量次序 | 1 | 2 | 3 | 4 | 5 |
电压U/V | 1.8 | 1.5 | 1.0 | ___________ | 0.3 |
电流I/A | 0.32 | 0.30 | 0.26 | ___________ | 0.18 |
②小灯泡正常发光时的电阻是
③第5次测量中,小灯泡不发光。小明断定是灯丝断了。这个判断是
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