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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:Static Electricity UsesThe following 18 comments and questions have been sent in. They are listed according to date. List of first 10 items
Advantages and disadvantages of static electricity?QuestionJuly 15, 2009 What are the Advantages and disadvantages of static Electricity? Albertina - Namibia 18025 AnswerThere are uses for static electricity, which could be its advantages. Any problems, such as creating sparks or static cling could be disadvantages. Is it possible to create an electrostatic field in a room?QuestionApril 6, 2009 I would like to make myself clear " is it possible to create an electrostatic field in a room, by providing two metal plates on opposite walls which are connected to positive and negative poles of the battery?" If it is possible, can same analogy can be extended to make a large space far apart say north pole and south pole? pl do clarify. Mythili - India 17561 AnswerIf you put two metal plates that are separated and connected to opposite poles of a battery, you have created a capacitor, which stores electrostatic energy. The strength of the capacitor is C = eA/d, where e is a dielectric constant of air. A is the area and d is the separation of the plates. How many uses for static electricity?QuestionFebruary 12, 2009 sorry i thought my teacher was cummin um i was wundering how many uses of electricity ther is, get me back mike - Canada 17260 AnswerStatic electricity is used in purifying the air, painting cars, and xerox machines. I am sure there are many other uses. How does fingerprinting use static electricity?QuestionJanuary 20, 2009 i was wondering if you knew how fingerprinting uses static electricity. and how does it work? what is the method? Jess - UK 17123 AnswerUsually when you touch something, a small amount of oil from your skin is left on the object. By "dusting" the object with special fine dust, the fingerprint can be seen. Is the Cottrell Precipatator still in use?QuestionMarch 27, 2008 About 35 years ago, I learned about something in a college Physical Science class called the Cotrell Precipatator. I think it had to do with static electricity and smokestacks (controlling pollution emmissions) attacting positive and negative ions. Jane - USA 15612 AnswerDr. Frederick Cottrell invented the device for charging particles and then collecting them through electrostatic attraction in 1907. It is the basis of the electrostatic precipitator or electrostatic air cleaner that is still used today. How does a capacitor work?QuestionJune 10, 2007 I have not understood how a capacitor works. SWATHI - INDIA 13906 AnswerA simple capacitor consists of two metal plates with an insulator or non-conductor between them. Positive charges collect on one plate and negative charges on the other. DC electricity cannot pass through a capacitor, while AC electricity does pass through the capacitor with a change of phase. How does smokestack pollution control work?QuestionApril 2, 2007 How does smoke stack pollution control use static electricity - Canada 13476 AnswerStatic electricity charges the particles of smoke in one part of the smokestack. Then there is a screen of the opposite charge, which attracts the particles and causes them to stick to the screen. Thus, most of the pollution particles do not get into the atmosphere. How to isolate circuits from static electricityQuestionOctober 19, 2006 I was wondering on how to isolate circuits from static electricity. Charlie - Australia 12206 AnswerStatic electricity is high voltage but low current. A problem that occurs is when a spark from an individual jumps over to a electronic circuit causing a surge of current through sensitive materials. By grounding a person with a grounding strap, you can usually isolate the circuit from static electricity. How can static electricity prevent air pollution?QuestionJuly 12, 2006 how can static electricity prevent air pollution?I already have an elecrto precipitator,is that the only way there is? - South Africa 11465 AnswerElectrostatic precipitators use static electricity to reduce the pollution from smokestacks. They could be used in other areas too on a smaller basis. For example, a paint shop may filter any dust and particles before it gets outside. Air ionizers do the same thing and follow similar principles. Wants a laptop Xerox machineQuestionFebruary 22, 2006 Respected Sir, swetha - INDIA 10186 AnswerA Xerox machine is very similar to standard PC scanner and printer. There are very small portable scanners presently available, There are also very small printers. That combination would be equivalent to a laptop Xerox machine. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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