(1)简要分析并说明,小型电中药锅处于低温挡时,开关S1和S2的连接状态;
(2)求发热电阻R2的阻值;
(3)求低温挡的功率;
(4)若该中药锅以中温挡的工作电路给已煲好的药液温热110s,实际消耗的电能为4.41×104J,则此时电路的实际电压。
额定电压/V | 220 |
额定功率/W | 高温档880 |
中温档440 | |
低温档______ |
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