小明家的电能表上标有“220V10A3000r/kW•h”的字样．当小明家中所有

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问题填空题

小明家的电能表上标有“220V 10A 3000 r/kW•h”的字样．当小明家中所有用电器同时工作时，电能表在1min内转了60转，由此可知，他家里所有用电器的总功率为 ______W；若全部用电器同时工作时的总电流不超过电能表的额定电流，小明家还可以增加 ______W以下的用电器．

答案

因为电路中每消耗1kW•h的电能，转盘转动3000转，所以当电能表转60转后，电路中消耗电能0.02kW•h．

0.02kW•h=72000J

1min=60s

根据功率计算公式，现有用电器的功率为：

P₁=

72000J

60s

=1200W

根据电能表的铭牌数据，电能表的最大功率为：

P₁=UI=220V×10A=2200W

还可以增加用电器的功率为：

P₂=P-P₁=2200W-1200W=1000W．

故答案为：1200，1000．

完形填空

I was in the kitchen making lunch when I saw my six-year-old son, Billy, walking toward the woods. I could only see his back. He 1  to be walking with a great effort, trying to be as 2 as possible.
A few minutes after he disappeared into the   3 , he came running toward the house again. I went back to making sandwiches,   4 that whatever task he had been doing was completed. Moments later, 5 , he was once again walking slowly toward the woods.
6 curiosity, I walked out and followed him on his journey. He was 7  both hands in front of him as he walked, being 8  not to spill the water he held in them. I secretly walked   9  behind him as he went into the woods and I saw the most amazing 10 .
Several large deer loomed in front of him. Billy walked right up to them. I almost 11   at him to get away. A huge male deer with elaborate（精美的）antlers was   12  close. But they didn’t even move as Billy   13 . And I saw a small deer lying on the ground, obviously suffering from   14 and extreme heat, lift its head 15  to drink the water cupped in my beautiful boy’s hands.
It was on this day that I learned the true lesson of 16 . You know, we hadn’t had any rain for three months and our crops were   17 . As the tears that rolled down my face began to hit the ground, they were suddenly   18  by other drops. I looked up at the sky. It was 19  God was moved to weep. The rain came that day and saved our farm, just like the 20 of one little boy who saved another.

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A．没有办理登记，质权未设立

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