What does AC stand for in electricity? Electricity: The electricity we use every day is actually made of electrons, the negatively-charged particles that orbit atoms. Electrical current is the flow of such electrons through a conductor, a substance that allows electrons to flow freely, such as ...
答案 D 结果二 题目 ___ dangerous it is to play with electricity! A. What B. What a C. What an D. How 答案 [答案]D[详解]句意:玩电是多么危险啊!考查感叹句。根据“!”可知,该句为感叹句,根据“dangerous”可知,该句的句型结构是:How+形容词+主语+谓语+其它。故选D。相关推荐 ...
AC electricity is used by the power grid, for example in household outlets. However, most standard electronic devices convert it into DC current with their internal circuitry. Why, then, does the power grid use AC current? The reason has to do with transmission. Resistance in power lines ca...
33. What does the underlined word “undermine” in paragraph 3 mean? A. Strengthen. B. Determine. C. Oppose. D. Justify. 34. How can negative expectations probably affect people’s performance in reality? A. By re...
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But devices transform AC electricity from your home wiring into DC using an adapter or converter. So what does alternating current actually mean? An alternating current is an electrical current that changes direction periodically. Instead of flowing in a single, constant direction like direct current...
(AC)What would happen if there were no electricity?Doing homework by candle?Walking to school?Boiling water over a little fire?Life is like that in many parts of Malawi, a small country in Africa.In 2001,William Kankwamba, a 14-year-old boy,had a simple wish- a light in his room.At...
These formulas are also useful in calculating AC (alternating current) wattage to determine the size of an inverter, which converts the DC electricity from a solar array to AC that can then be used to power lights and appliances in homes and businesses. Appliances include a face plate which ...
Who founded electricity and how do we use it today? How can you explain work, in regards to electricity? What is the nature of current transmitted from a power station? What does it mean for electric current to be a scaler? 1) What is energy? 2) Name the different forms of energy. ...
Plug-in Hybrid Electric Vehicles (PHEVs):These cars also have a battery that can be charged from an outside source, along with a gasoline engine. Fuel Cell Electric Vehicles (FCEVs):These use special cells that turn hydrogen fuel into electricity. This electricity then powers the car’s ele...