一吨水从15度加热到90度要多少电 一吨水从15℃加热到55℃，需要多少度电
\u4e00\u5428\u6c34\u753115\u5ea6\u52a0\u70ed\u523090\u5ea6\u9700\u8981\u591a\u5c11\u70ed\u91cfQ=cm(T-T0) C\u662f\u6c34\u7684\u6bd4\u70ed\u5bb9=4200. m\u662f\u6c34\u7684\u8d28\u91cf=1000 kg,T-T0=90-15=75 \u2103
Q=4200X1000X75=315000000\u7126\u8033
\u5c061\u5428\u51b7\u6c34\u4ece15\u2103\u52a0\u70ed\u523055\u2103\u6240\u9700\u8981\u7684\u70ed\u91cf\u8ba1\u7b97\u516c\u5f0f\uff1a
Q=1000\u516c\u65a4\u00d7\uff0855\u2103-15\u2103\uff09\u00d71\u5343\u5361/\u516c\u65a4\u2103=40000\u5343\u5361\u3002
1\u3001\u7535\u70ed\u6c34\u5668
A. \u7535\u70ed\u6c34\u5668\u7684\u7535\u70ed\u8f6c\u6362\u7387\u4e3a95%\uff0c\u6bcf\u5ea6\u7535\u4ea7\u751f\u7684\u70ed\u91cf\u662fQ=860\u5343\u5361/\u5ea6\u00d795%=817\u5343\u5361/\u5ea6\u3002
B. 1\u5428\u70ed\u6c34\u7684\u8017\u7535\u91cf\u4e3a40000\u5343\u5361\u00f7817\u5343\u5361/\u5ea6=48.96\u5ea6\u3002
C. \u6c11\u7528\u7535\u4e3a0.558\u5143/\u5ea6\uff0c\u5219\u6bcf\u5428\u70ed\u6c34\u8d39\u7528\uff1a0.558\u5143/\u5ea6\u00d748.96\u5ea6=27.3\u5143\u3002
D.\u5546\u4e1a\u7528\u7535\u4e3a1.2\u5143/\u5ea6\uff0c\u5219\u6bcf\u5428\u70ed\u6c34\u8d39\u7528\uff1a1.2\u5143/\u5ea6\u00d748.96\u5ea6=58.7\u5143\u3002
2\u3001\u7a7a\u6c14\u6e90\u70ed\u6cf5
A. \u5317\u65b9\u7a7a\u6c14\u70ed\u80fd\u70ed\u6c34\u5668\u5168\u5e74\u5e73\u5747\u70ed\u6548\u7387\u662f\u7535\u70ed\u6c34\u5668\u76843\u500d\uff0c\u6bcf\u5ea6\u7535\u4ea7\u751f\u7684\u70ed\u91cf\u4e3a860\u5343\u5361/\u5ea6\u00d795%\u00d73=2451\u5343\u5361/\u5ea6\uff1b
B. 1\u5428\u70ed\u6c34\u7684\u8017\u7535\u91cf\u4e3a40000\u5343\u5361\u00f72451/\u5ea6=16\uff1b
C. \u6c11\u7528\u7535\u4ef7\u4e3a0.558\u5143/\u5ea6\uff0c\u6bcf\u5428\u70ed\u6c34\u8d39\u752816\u00d70.558\u5143/\u5ea6=9\u5143\u3002
D. \u6c11\u7528\u7535\u4ef7\u4e3a1.2\u5143/\u5ea6\uff0c\u6bcf\u5428\u70ed\u6c34\u8d39\u752816\u00d71.2\u5143/\u5ea6=19\u5143\u3002
3\u3001\u592a\u9633\u80fd\u70ed\u6c34\u5668
A. \u6309\u7167\u534e\u5317\u5730\u533a\u5168\u5e74\u5e73\u5747120\u5929\u65e0\u65e5\u7167(\u9634\u5929\u3001\u4e0b\u96e8)\uff0c\u9700\u7535\u52a0\u70ed\u8865\u5145\uff0c \u666e\u901a\u592a\u9633\u80fd\u5219\u6bcf\u5428\u70ed\u6c34\u8d39\u7528\uff1a(48.96\u5ea6\u00d7120\u5929)\u00f7365\u5929=16.1\u5ea6\u00d70.558\u5143/\u5ea6=8.98\u5143\uff0c\u5546\u4e1a\u7528\u7535\u70ed\u6c34\u4ef7\u683c\u4e3a16.1\u5ea6\u00d71.2\u5143/\u5ea6=19.3\u5143
B. \u901a\u8fc7\u516c\u53f8\u72ec\u7279\u7684\u80fd\u91cf\u56de\u6536\u548c\u6392\u7a7a\u529f\u80fd\uff0c\u6bd4\u666e\u901a\u592a\u9633\u80fd\u518d\u8282\u80fd30%\u3002\u65e5\u7167\u8f83\u5f3a\u6c34\u7bb1\u6e29\u5ea6\u53ef\u63d0\u5347\u81f370\u5ea6\uff0c\u5b58\u50a8\u591a\u4e8e\u70ed\u91cf\uff0c\u4fdd\u8bc1\u9634\u96e8\u5929\u6c14\u6b63\u5e38\u5b9e\u7528\u3002\u6bcf\u5e743\u6708\u81f311\u6708\uff0c9\u4e2a\u6708\u57fa\u672c\u65e0\u9700\u7535\u8f85\u52a9\u52a0\u70ed\u300212\u6708\u81f32\u6708\uff0c\u51ac\u5b633\u4e2a\u6708\u517190\u5929\u592a\u9633\u80fd\u8282\u7efc\u5408\u8282\u80fd\u7387\u4e3a50%\u3002
Q=4200X1000X75=315000000焦耳.用这个数字除以3600，把时间换算过来就行了
315000000/3600=875度。当然通常还要除以你的用电器的功率哦！
一楼的算错鸟。一度电=3600000焦耳
一吨水温度每升高一摄氏度需要的热量为：
Q =4.2×10^3J/(㎏•℃)×1m^3×1.0×10^3㎏/m^3×1℃ =4.2×10^6J
升高75摄氏度所需的热量Q=3.15×10^8J
所需的电量为3.15×10^8/3.6×10^6J=87.5度
需要参考加热器的功率。
1000W一小时用电1度。
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