题目

We spoke to three students from around the world about different national holidays. There are different customs (习俗) for each festival .Tan Xiaodong, 15, Hong Kong, China“It’ll soon be Chinese New Year. Before it, we’ll clean the house and decorate it for good luck. Every shop is going to close for a few days and we’ll go out a lot to celebrate in the streets. We might go and see the lion and dragon dances in the city center. I love this festival. ”Wendy, 16, Sydney, Australia“Australia Day is on 26th January and it’s an important holiday here. We always have a Monday off, so小明和妈妈一起去商场选购了“爱心牌”全自动豆浆机，回到家，他马上阅读了使用说明书，了解了豆浆机的主要结构（如左图）、使用方法及注意事项，并观察了豆浆机铭牌（如右图），电路原理图可等效成中图。下表是豆浆机正常工作做一次豆浆的过程中电热管和电动机工作时间与对应的工作状态。请你帮小明解决下列问题：（1）豆浆机正常工作做一次豆浆，电流做功多少？（2）小明想了解家里电路的实际电压，于是将家里的其它用电器都关闭，他观察到豆浆机的电热丝工作时，家里标有“2000r/kW·h”字样的电能表转盘在3min内转了50转，则他家电路的实际电压是多少？（不考虑温度对电阻的影响）