温度 | 90 | 80 | 66 | 60 | 50 | 46 | 40 | 36 | 35 |
10 | 20 | 40 | 50 | 70 | 80 | 100 | 120 | 130 |
(1)电热丝R工作时的电流为多少?
(2)电热丝R通电10s产生的热量为多少?
(3)已知控制电路的电源电压U=6V,当调节滑动变阻器R2=70Ω时,烘干机内温度至少多高会发出报警信号?
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