小明家买了1个豆浆机,额定电压220V,电机额定功率200W,额定频率50Hz,加热器额定功率750W,看下面↓
在用电高峰期,若电压只有210V,豆浆机实际加热功率多少?【设电阻丝的电阻不随温度变化】
人气：454 ℃ 时间：2019-08-19 18:17:50
解答
R=U额^2/P=220*220/750=64.53欧
P实=U实^2/R=210*210/64.53=683.4W* 是X号吗？还有/是除号？或者分之几？是的，* 是X号 /是除号
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