额定电压 | 220V |
高温挡 | 660W |
中温挡 | 440W |
低温挡 | **W |
(2)求电热足浴器低温挡的额定功率是多少?
(3)用电热足浴器加热4kg、初温为20℃的水到45℃时,水吸收的热量为多少?
(4)用电热足浴器的高温挡加热一定质量的水,当水温加热至45℃后自动切断电源,当水温降至40℃时,又自动接通高温挡加热电路。小林在水温第一次加热至45℃时开始足浴,水温随时间变化的图像如图丙所示,共用时55min,若加热过程电热足浴器正常工作,求这次足浴消耗的电能是多少?
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