(1)断开S2,闭合S1,调节R1的阻值,使满偏;保持R1的阻值不变,闭合S2,调节R2,当R2的阻值为4.8Ω时的示数为48.0mA.忽略S2闭合后电路中总电阻的变化,经计算得RA=
(2)保持S1闭合,断开S2,多次改变R1的阻值,并记录电流表的相应示数.若某次R1的示数如图(b)所示,则此次R1的阻值为
(3)利用记录的R1的阻值和相应的电流表示数I,作出I-1-R1图线,如图(c)所示.用电池的电动势E、内阻r和电流表内阻RA表示I-1随R1变化的关系式为I-1=
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