问题
问答题
小红家有一种彩色灯泡，它只有在36V电压下才能正常工作，她想把彩色灯泡接在家庭电路中工作，请你帮她想办法，需要多少只灯泡以什么方式连接在家庭电路中，才不至于被烧坏？
答案
答：这些小灯泡要连接在家庭电路中，并且不被烧坏，所以要串联．
已知电源电压为220V，小灯泡的额定电压为36V，要使灯泡不被烧坏，需要
≈7只灯泡串联．220V 36V
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小红家有一种彩色灯泡，它只有在36V电压下才能正常工作，她想把彩色灯泡接在家庭电路中工作，请你帮她想办法，需要多少只灯泡以什么方式连接在家庭电路中，才不至于被烧坏？
答：这些小灯泡要连接在家庭电路中，并且不被烧坏，所以要串联．
已知电源电压为220V，小灯泡的额定电压为36V，要使灯泡不被烧坏，需要
≈7只灯泡串联．220V 36V
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| We're lucky to live in a rich country where we have many things. However, most of us usually 1 some things. Electricity is one thing that we waste most. Lights, TVs, 2 and other things are often kept on even when no one is using them. We should turn them off when we don't need them. It 3 less a second to do it. Anyhow, not wasting electricity saves money, because we don't have to 4 the electricity we do not use. The second thing that we often waste is water. Fresh water is precious (珍贵的), 5 it shouldn't be wasted. It is only a simple matter of turning off a tap. I am sure 6 can do this easily if he wants to. 7 big waste is food. My mother 8 cook so much food that much of it was thrown away. I told her we had wasted so much food. She thought I was right and now cooks 9 what we can eat. It is 10 to be wasteful. I find there is a simple way of not wasting things. That is to use only what we need. Do not touch what we do not need. In this way we can stop being wasteful. | ||||
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