A.电源E:电动势为,内阻不计
B.电流表:量程为,内阻
C.电流表:量程为,内阻约为
D.电阻箱:阻值范围
E.定值电阻:
F.开关S、导线若干
(1)为了较准确地测量电阻,某同学设计了图甲的实验电路图,根据所设计的电路图,设电流表的示数分别为,电阻箱的电阻为,则的测量值为
(2)该同学根据实验测量结果,做出压敏电阻随所加外力F的图像,如图乙所示,则由此图像可知,随压力F的增大,压敏电阻的阻值
(3)该同学将这种压敏电阻与一个量程为的理想电压表按如图丙所示电路改装成测量压力的仪表,已知电源,内阻不计,为了使改装后的压力表的量程为,压力为时对应电压表的刻度,则定值电阻R应取
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