小强家最近买来了一台“JYDZ﹣16C”型九阳豆浆机
编辑: admin 2017-27-02
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(1)硬度大;电能转化为机械能和内能
(2)
①Q 吸 =cm(t﹣t 0 )=4.2×10 3 J/(kg·℃)×1.5kg×(100℃﹣15℃)=535500J
②15min=900s,2min=120s
电热器消耗电能为:W 1 =P 1 t 1 =750W×900S=675000J
电机消耗电能为:W 2 =P 2 t 2 =180W×120s=21600J
所以,整个过程消耗的电能为:W=W 1 +W 2 =675000J+21600J=696600J