Kerosene oil lanterns and gas lamps are now things of the past. We now light our lamps with electricity. Switch on the button and there is the day-like light even in the darkest night. In summer seasons electric fans‚ air conditioning plants are used to provide us with cool atmosphere. In winter‚ heating plants are used to keep the room warm. Electric bells‚ press and stove are things of every-day use. People keep refrigerators in their homes to keep their food in a fresh condition. Indeed electricity
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SAMPLE PAPER-2013 CLASS-XII Subject : Physics Time allowed : 3 hours Maximum Marks : 70 General Instructions : i) All questions are compulsory. ii) Question numbers 1 to 8 are very short answer type questions‚ carrying one mark each. iii) Question numbers 9 to 18 are short answer type questions ‚ carrying two marks each. iv) Question numbers 19 to 27 are also short answer type questions‚ carrying three marks each. v) Question numbers 28 to 30 are long answer type questions
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Fundamental of Electronics Nature: Term Paper 1. What device is used to store electric charge? - A capacitor is used to store energy or electric charge in electric field while inductor is used to store energy in magnetic field. 2. What quantity indicates the amount of stored electric charge? - The quantity that indicates the amount of stored electric charge is the Electric Potential. 3. Compare the laws for resistors in series and parallel with those for capacitors in series and parallel
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Have modern technologies made the world better place? Most past of contemporary people cannot imagine their life without different devices‚ because they have to use it every day. Considering only our cell-phones or smartphones: we call‚ we send text-messages‚ look for necessary (or not) information in the internet‚ make notes‚ etc. We can use computer for a large amount of things‚ from typing a paper or sending a complaint somewhere to creating a music or attending lecture in the different part
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Earth’s Magnetic Field Introduction Earth’s magnetic field is one of the world’s most complicated features. It started to be observed in 1845 by a scientist named Carl Friedman Gauss (Sarfati). The magnetic field is generated inside of the earth’s core and there are many scientists who still debate over how it was first created. There are also many arguments about the many changes that the field has gone through in it’s existence. These arguments are mostly either for a young-earth model or
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Series and Parallel Circuits Name:_____________________________________________ Directions: 1. Go to the following website: http://phet.colorado.edu/en/simulation/circuit-construction-kit-ac-virtual-lab 2. Click “Run now.” You now have the raw material to create a circuit. Take a moment to look over the site and find all the different materials. To build a circuit you will need several wires‚ a light bulb‚ a voltage source‚ a voltmeter‚ and a non – contact
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Introduction Did you know that you probably used an electric motor today? Yes‚ that’s right. If you put on clothes that were washed in a washing machine‚ rode in a car‚ ate food from a fridge‚ warmed up lunch in a microwave‚ or played a video game‚ you used an electric motor! Try this science fair project and you’ll learn how to make a simple electric motor by having two magnets "talk" to each other. As they interact‚ they will alternate between "liking" each other (being pulled together)‚ and "disliking"
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It is very important to control the pendulum pulverizer feeder‚ which concerning the grinding efficiency and the quality of its granularity. The following passage will introduce the methods to control the pendulum feeder and its automatic feeding amount. The pulverizer feeder takes the electromagnetic vibrating way by using the double directional force of particles system. It’s made of the chute the coupling part and the armature. The whole electric vibrating feeder should hang in freely state
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Literature Search Both Design 2 and Design 3 circuits uses the concept of voltage doubler rectifier in particular the Greinacher voltage doubler rectifier‚ where the components used are mainly capacitors‚ diodes. Light emitting diode (LED) and 3-turn coil are also incorporated into Design 2 and Design 3 circuits. There are two main reasons of using a voltage doubler rectifier. Firstly‚ the LED require a forward voltage of 1.7V to 2.2V‚ and the 3-turns coil on the implant will not be able to pick
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1. Go to http://phet.colorado.edu 2. Click on electricity and magnetism sims. 3. Select the simulation “Magnets and Electromagnets.” It is at this link http://phet.colorado.edu/new/simulations/sims.php?sim=Magnets_and_Electromagnets 4. Move the compass slowly along a semicircular path above the bar magnet until you’ve put it on the opposite side of the bar magnet. Describe what happens to the compass needle. 5. What do you suppose the compass needles drawn all over the screen
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