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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:DC CircuitsThe following 29 comments and questions have been sent in. They are listed according to date. List of first 10 items
IGCSE Physics questionQuestionMay 10, 2009 I have a doubt with a question in IGCSE Physics paper 3, the question paper is available in the following link: John - Sweden 17723 AnswerIn a parallel circuit, the total resistance R is found from 1/R = 1/Rx + 1/Ry + 1/Rz. Since V = IR = 12 volts, 1/R = I/12. Substitute that into the equation and solve for Ry. How can a vacuum tube burn out without oxygen?QuestionDecember 18, 2008 dear sir Gurjinder - India 16976 AnswerIn a vacuum tube, there is usually a small amount of an inert gas, similar to a light bulb. But some vacuum tubes are close to being a vacuum. Why is a parallel circuit seldom used?QuestionAugust 30, 2007 why is parallel circuit seldom used in connecting dry cell? KAREN - Philippines 14283 AnswerA parallel circuit may draw too much current from a dry cell, thus it is seldom used. Dry cell batteries sometimes corrode and can damage a flashlight if not used much. Modern batteries do not do this as much as older or less expensive dry cells. Please help me!!!QuestionAugust 21, 2007 Please help me!!! Abdi - Ethiopia 14229 AnswerYou need to be specific about what you do not understand. Help you with what? Can a step-up transformer be a step-down?QuestionJuly 9, 2007 a step up transformer can also be used as step down? saravanan - India 14042 AnswerYes. The transformer used to reduce high voltage to house voltage is a step-down transformer. It is just changing the primary and secondary. Should add information on electrical devicesQuestionFebruary 1, 2007 The lecture was amazing, but u should add the introduction of electrical devices like resistor, capacitor on inductors. What i want to know is the resistive effects and current distribution of these electrical devices Fiza - Pakistan 13027 AnswerThank you for your feedback and your suggestion. We plan to add information on those simple of electrical devices soon. How many milliamps in a D cell battery?QuestionDecember 29, 2006 how many milliamps do a typical d cell battery that you would purchase from any store have? thank you. james - USA 12713 AnswerThe current depends on how much resistance is in the circuit. With little or no resistance, the current could be very high--over several amps. To figure the amperage, divide 1.5 by the number of ohms in your resistance to get the amperage of the current. Which way does current flowQuestionOctober 23, 2006 which way does current flow around a DC circut? Dominic - UK 12223 AnswerConvention says that the current flows from positive (+) to negative (-). But the electrons really flow in the opposite direction. Solving enigmas of DC circuitsQuestionJuly 22, 2006 i am 17 and i think these are good notes.It will be very kind of u if u can send me some points that can help me in my exam to solve enigmas of DC circuits,i know some things like "if we have equal potential between 2 junctions then we can make it a single junction". It will be great if u can send some stuff like that... Varun - INDIA 11522 AnswerA major concept in circuits is that a circuit can be considered what they call a "black box", meaning that the output doesn't care what is inside the box, provided conditions are the same. One example is that the resistance of the "box" will be the same whether you have one 100 ohm resistor or a 75 ohm and 25 ohm resistor, provided they are in series. How can a radio operate from DC?QuestionJune 5, 2006 Since a portable radio contains electronic circuitry including capacitors and inductors, how is it that it can operate from DC (batteries)? Jean - USA 11283 AnswerThe radio contains a DC-to-AC inverter, which is a circuit that changes the power to AC. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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