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Reader questions and feedback on physical science. Also refer to physics, chemistry, astronomy, electricity, magnetism, electromagnet, light, sound, waves, forces, work, energy, friction, heat, thermodynamics, Ron Kurtus, School for Champions. Copyright © Restrictions Answers to Readers' Questions on Physical Science:AC World VoltagesThe following 65 comments and questions have been sent in. They are listed according to date. List of first 10 items
Using a 50 Hz power capacitor bank at 60 HzQuestionAugust 21, 2009 Unless specified by the manufacturer to operate on both 50 and 60 Hz, appliances may not operate efficiently or even safely if used on anything other than the intended frequency. Could you explain me a litle more in the case of power capacitor bank manufactured for 50 Hz and used at 60 Hz? David - Cuba 18180 AnswerIt is true that appliances may not operate efficiently or correctly at the wrong frequency. In some cases, operation will be sufficient, but it is always best use the device as intended. Viewpoint on using 50 Hz AC electricityQuestionJune 15, 2009 The reason that parts of the world adopted the 50 hertz 220 voltage was due to what they seen on the generator and the capacity of the wire. Start a generator up and have is set for 60 hertz and then turn it down to 50. You will see why anyone setting the standards for the power requirements would rather run it at 50 than at 60. The average generator can achieve 50 hertz at almost an idle and if you run more voltage over your line you get the benefit of decreasing your wire size do to the lower amount of current being carried. Smaller cable=less copper=less expensive wire. shawn - USA 17913 AnswerThanks for your view on why many countries use 50 Hz AC electricity. Why do so many countries use 50Hz AC?QuestionMay 27, 2009 hi there! u did a great effort to explain these critical things but you have nowhere given exact answer if using 60 hz is economical then why most of the countries are using 50hz......... Ashutosh - India 17811 AnswerIn the early days of electricity, the German company AEG became a virtual monopoly in Europe. They decided to use 50Hz instead of 60Hz to better fit their metric standards. Unfortunately, so many countries started using 50Hz because of them, that it was difficult to later change to the more efficient 60Hz. Using a 50 Hz LCD television on 60 HzQuestionApril 22, 2008 What is the effect of using a 37" LCD TV 220-240V, 50HZ to a 220V, 60 Hz system? I bought an LCD with above specs and would like to know the effect in terms of picture quality,resolutions, life of the LCD etc. Gerry - Philippines 15774 AnswerMost systems automatically adapt to either frequency, but there are some that don't. If it does not automatically adapt, the different frequency may affect the scan speed and picture quality. Using an inductor and resistor in a circuitQuestionFebruary 23, 2008 salam. nadeem - Pakistan 15420 AnswerOne of the major uses of the phase shift occurs when you combine an inductor with a resistor and capacitor. That is used as a tuning circuit for radio and television. A circuit with an inductor and resistor may be used with other circuits to achieve effects, but it has only a minor use. Why does the US use 120V?QuestionJanuary 25, 2008 why does US use 120volts and india & germany use 220volts ?what will happen if i use a product which works in220volts in US without an adapter? hari - USA 15208 AnswerThe lesson explains why the countries use the voltages they do. Why does India use 220V?QuestionJanuary 24, 2008 why in india we use 220volts while in other countries they use 110volts .please i want exact answer for this question thanga - India 15201 AnswerAround 1950 Great Britain switched over from 110V to 220V to follow the lead of other European countries. Even though they no longer ruled India, they still had influence there. It was convenient for India to use 220V, since they got much equipment from Great Britain and other European countries. Purchasing flat-screen TV to use in AfricaQuestionDecember 9, 2007 Hello! I am looking to purchase a flat-screen tv from the U.S. to use in Africa. Can you suggest what brands could I buy or do I need to purchase a converter? Thanks! Jennifer - USA 14945 AnswerThe voltage requirements depend on the country in Africa. Many brands have a 110V-220V switch on the back that allow you to change voltage levels. but the outlet plug may be different, requiring you to use an adapter. Will CONIA air conditioner work at 60Hz?QuestionNovember 30, 2007 I bought an airconditioner (CONIA Brand ) here in the philippines. It is brand new and is working fine during the testing at the store. However it is 220/240V 50hz and our supply is 220 60hz. Frank - Philippines 14880 AnswerThe difference in voltage is not a problem. Using 60Hz means that the motor will run slightly faster. Wants to buy an LCD TV in Europe to use in U.S.QuestionNovember 12, 2007 Hi, josh - USA 14766 AnswerTypically, using 50Hz on a TV will not harm it, and it will work OK. Note that many LCD TV sets are made in Japan, where they use both 50Hz and 60Hz. It still would be a good idea to contact the manufacturer of the brand you want to buy and verify that there will be no problems. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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