额定电压 | 220V | ||
额定功率 | 高温档 | 中温档 | 低温档 |
880W | 440W | 220W |
(1)当开关S1断开,S2接a时,该电火锅选用
(2)当电火锅使用中温档正常工作时,电路中电流是多大
(3)用电火锅高温档在额定电压下烧水7分钟,电流做了多少功?若电热丝产生的热量全部被水吸收,在1个标准大气压下,能使1kg初温为20℃的水升高多少℃
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