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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 70 comments and questions have been sent in. They are listed according to date. List of first 10 items
Details of HVDCQuestionAugust 19, 2010 details of HVDC arjunan - India 20260 AnswerSorry, we do not have that information. Why is 50Hz used in India?QuestionAugust 16, 2010 why 50hz in ac harsha - India 20247 AnswerIn the early days of electricity, a company in Germany started using 50Hz instead of 60Hz. Since they sold equipment to other countries, many of them changed to 50Hz. India changed to 50Hz because England was using that frequency. Why does India use 220V AC?QuestionAugust 12, 2010 1. why india goes for 220v,50hz?what is the reason? balaji - India 20226 AnswerGreat Britain (England) changed over to 220V 50Hz in the 1950s to follow what other countries in Europe did. Since there was a great influence from England in India, even after India gained its independence, that country follow the same standard. Will clock run faster or slower at 59 Hz?QuestionApril 29, 2010 Will freq range set at 59 hz affect 60 hz meters, clocks, to run faster or slower? George - USA 19631 AnswerClocks will run slightly slower at 59 Hz. Problems with voltage fluctuations in New DelhiQuestionMarch 28, 2010 sir, dr prashanna - India 19454 AnswerThe quality of electrical current is a problem in all countries. In the United States manufacturers of sensitive x-ray equipment will actually send in technicians to check the wiring in a hospital or medical facility to try to minimize problems with improper grounding and voltage fluctuations. 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. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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