额定电压 | 220V |
额定加热功率 | 1100W |
额定容量 | 1.8L |
(2)现将电热水壶内加入1.0L水后接入电力监测仪。已知水的密度比热容;
①加热过程中,水温刚达到80℃时,电力监测仪测得本次的用电量如图丙所示,不计热量损失,求水的初始温度;
②保温过程中,电力监测仪测得电压为220V,电功率为40W,求R2的阻值。
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